Ruben Stone plays drums in the avant-garde metal duo Blackgammon, with his singer girlfriend, Lou. They live in an RV and tour the United States performing gigs. When Ruben begins to lose his hearing, he goes to a pharmacy seeking a diagnosis. The pharmacist refers him to a doctor, who finds that Ruben has lost most of his hearing and that the rest will deteriorate rapidly. Although cochlear implants may benefit him, insurance does not cover the high cost. The doctor suggests that Ruben eliminate all exposure to loud noises and undergo further testing, but Ruben continues to perform. Lou wants to stop performing for his safety, but Ruben wants to continue. She is also concerned about his sobriety, as he is a recovering drug addict. They call his sponsor, Hector, who finds a rural shelter for deaf recovering addicts run by a man named Joe, a recovering alcoholic who lost his hearing in the Vietnam War. Ruben leaves with Lou because they will not let her live there with him, and he wants only the implants. Anxious for his well-being, Lou leaves and persuades Ruben to return to the shelter. Ruben meets the other members of the shelter, attends meetings, and settles into his new life. He is introduced to schoolteacher Diane and the children in her class and learns American Sign Language. Joe tasks Ruben with writing and sitting peacefully in his study in an effort to make him comfortable with the silence. Ruben joins Diane's class and connects with the children and the rest of the community. He gives the children and Diane drumming lessons. Joe invites Ruben to stay as an employee of the community. Ruben illicitly uses Joe's office computer to follow Lou's activities and learns she is performing music in Paris. He has his friend Jenn sell his drums and other music equipment, then he sells his RV, using the money for cochlear implant surgery. Ruben asks Joe to loan him money to buy back his RV while he awaits the activation of the implants. Joe refuses, saying that Ruben is behaving like an addict. He asks Ruben if he's experienced any moments of stillness during his time in his study, before asking him to leave the community, as it is founded on the belief that deafness is not a handicap. Ruben has his implants activated but is disappointed by their distorted sound. He flies to Paris to meet Lou at the home of her wealthy father, Richard. Richard confides in Ruben that though he initially disliked him, he recognizes that Ruben made Lou happy. Lou has settled into her new lifestyle and has ceased self-harming. At a party, Lou and Richard perform a duet; Ruben's perception of the sound is distorted by the implants. When Ruben tells Lou he wants to return to their music, she responds with interest but begins scratching her arms. Ruben tells her all is well and that she saved his life. She tells him that he saved hers too. The next morning, Ruben takes his things and leaves while Lou sleeps. In a park, the ringing of a church bell is distorted by his implants; Ruben removes his processors and sits in silence.

In the Northside of Dublin, Ireland, Jimmy Rabbitte is a young music fanatic who aspires to manage an Irish soul and rock and roll band in the tradition of 1950s and 60s African-American recording artists. He places an advert in the local newspaper and holds auditions in his parents' home. After being deluged by several unsuitable performers, Jimmy decides to put together a band consisting of friends and people he encounters—lead singer Deco Cuffe, guitarist Outspan Foster, keyboardist Steven Clifford, alto saxophonist Dean Fay, bassist Derek Scully, drummer Billy Mooney, and female backup singers Bernie McGloughlin, Natalie Murphy and Imelda Quirke. Jimmy then meets trumpeter Joey "The Lips" Fagan, a veteran musician who offers his services, and has unlikely stories about meeting and working with famous musicians. Joey names the band "The Commitments". After purchasing a drum set and acquiring a piano from Steven's grandmother, Jimmy secures the remainder of the band's musical equipment from Duffy, a black market dealer. The band rehearses on the first floor above a snooker hall, and after much practice, they convince a local church community centre to give them a gig, under the pretence of it being an anti- heroin campaign. Jimmy then hires Mickah Wallace, a belligerent and hot-tempered bouncer, to act as the band's security. The band draws a good crowd, but after Deco inadvertently hits Derek with his microphone stand, the amplifiers explode, resulting in a power outage. Tensions run high among the band members, as Joey seduces Natalie, then Bernie, then Imelda, all while Deco grows increasingly obnoxious and unruly, believing himself to be the star of the band. The band performs at another venue where, at the end of one song, Billy accidentally knocks over his hi-hat cymbals, leading to a heated argument between him and Deco. Billy leaves the band in fear of going to jail if he beats up Deco – much to Jimmy's frustration – and Mickah replaces him as the band's drummer. During the band's next performance at a roller disco, their first paying gig, Jimmy is confronted by Duffy, who demands payment for the equipment he provided the band. Mickah intervenes and violently attacks Duffy, who is escorted out. Jimmy then goes on stage and introduces the band, which elicits boisterous cheers from the audience. After the band secures another gig, Joey promises Jimmy that he can get his friend, Wilson Pickett, to sing alongside them. On this promise, Jimmy convinces several journalists to attend the band's next performance. At the venue, the band draws a large crowd, but its members begin arguing with each other offstage, and become doubtful when it appears that Pickett will not show. They go back on stage, where Deco denounces Jimmy for misleading the audience about Pickett's appearance; the band's performance of one of Pickett's songs, " In the Midnight Hour ", silences the crowd's protests. After the performance, the fighting continues; during a heated argument, Mickah beats up Deco outside the club, and Jimmy storms off in frustration, claiming that the band is finished. Joey follows Jimmy, who berates him for misleading the band about Pickett. Joey apologizes to Jimmy, and assures him that despite the band breaking up, Jimmy is still a success for helping the others realize their self worth and potential to rise above their previous lot in life. Just as Joey leaves, Pickett's limousine pulls up next to Jimmy, and his driver asks for directions to the club, revealing that Joey was telling the truth about Pickett; he just showed up too late. In a closing monologue, Jimmy explains that the band's members have since gone their separate ways; Bernie joined a country band, Deco got his record deal and became a bigger egomaniac, Mickah sings for a punk band, Outspan & Derek still play as street buskers, Dean formed a successful jazz band, Joey's mother got a postcard that he was touring with Joe Tex (who had died a decade prior), Steven became a doctor but misses playing music, Billy is recovering from getting kicked in the head by a horse, Imelda married Greg (who won't let her sing anymore), Natalie became a successful solo singer, and implies that she and Jimmy are in a relationship.

The story centres mainly upon six characters: Gordon (a Lieutenant of the Royal Scots Fusiliers); Audebert (a French Lieutenant in the 26th Infantry and reluctant son of a general); Horstmayer (a Jewish German Lieutenant of the 93rd Infantry); Father Palmer (a Scottish priest working as a chaplain and stretcher-bearer); and two famous opera stars, German tenor Nikolaus Sprink (based on Walter Kirchhoff) and his Danish fiancée, mezzo-soprano Anna Sørensen. The film begins with scenes of schoolboys reciting patriotic speeches that both praise their countries and condemn their enemies. In Scotland, two young brothers, Jonathan and William, join up to fight, followed by their priest, Father Palmer, who becomes a chaplain. In Germany, Sprink is interrupted during a performance by a German officer announcing a reserve call up. French soldier Audebert looks at a photograph of his pregnant wife, whom he has had to leave behind (in the occupied part of France, just in front of his trench), and prepares to exit into the trenches for an Allied assault on German lines. However, the assault fails, with the French and British taking many casualties while William loses his life. In Germany, Anna gets permission to perform for Crown Prince Wilhelm, and Sprink is allowed to accompany her. They spend a night together and then perform. Afterward, Sprink expresses bitterness at the comfort of the generals at their headquarters and resolves to go back to the front to sing for the troops. Sprink initially opposes Anna's decision to go with him, but he agrees shortly afterward. The unofficial truce begins when the Scots begin to sing festive songs and songs from home, accompanied by bagpipes. Sprink and Sørensen arrive on the German front line, and Sprink sings for his comrades. As Sprink sings " Silent Night ", he is accompanied by Father Palmer's bagpipes from the Scottish front line. Sprink responds to Palmer and exits his trench with a small Christmas tree, singing " Adeste Fideles ". Following Sprink's lead, Audebert, Horstmayer, and Gordon meet in no-man's-land and agree on a cease-fire for the evening. The various soldiers meet and wish each other "Joyeux Noël", "Frohe Weihnachten", and "Merry Christmas". They exchange chocolate, champagne, and photographs of loved ones. Horstmayer gives Audebert back his wallet containing a photograph of his wife, which was lost in the attack a few days prior, and they connect over pre-war memories. Father Palmer celebrates a brief Mass for the soldiers (in Latin as was the practice in the Catholic Church at that time), and the soldiers retire deeply moved. However, Jonathan remains totally unmoved by the events around him, choosing to grieve for his brother. The following morning, the Lieutenants agree to extend the truce to allow each side to bury their dead, followed by cordial fraternisation for the rest of the day. As their soldiers play football, Audebert and Horstmayer sympathise, speaking in French of their memories of Paris and Lens, and their families. Horstmayer offers to take a letter to Lens for Audebert's wife. The next day, as the German forces shell the Allied position, Horstmayer offers to shelter the French and British soldiers in his trench, an offer Audebert and Gordon return to protect the Germans from their own retaliatory bombing. Before parting, aware that the truce has now truly ended, Audebert and Horstmayer lament that they cannot be friends, and hope that they both survive the war. As Audebert compliments Horstmayer on his French, the German reveals that his wife is French. Prior to the bombing, Horstmayer learns that Anna and Sprink left without the German superior's assent to entertain fellow front soldiers and informs both that Sprink is going to be arrested for disobedience. As the Germans regain their trenches, Anna and Sprink remain behind and ask Audebert to take them as captives, in order to avoid separation. Letters that they hand over to him from the German soldiers (who had been hoping Anna would deliver them when she returned to Berlin), as well as letters from soldiers all across the front, are intercepted by military authorities, revealing that the truce had occurred. Father Palmer is being sent back to his own parish and his battalion is disbanded as a mark of shame. Despite emphasising the humanity and goodwill of the truce, he is rebuked by the bishop, who then preaches an anti-German sermon to new recruits, in which he describes the Germans as inhumane and commands the recruits to kill every one of them. Father Palmer overhears the sermon and removes his cross as he leaves. Back in the trenches, the Scots are ordered by a furious English major (who is angered by the truce) to shoot a German soldier who is entering no-man's-land and crossing towards French lines. All of the soldiers deliberately miss in response, except the bitter Jonathan, who shoots the targeted German soldier. Audebert, hearing the familiar alarm clock ringing outside, rushes out and discovers that the soldier is a disguised Ponchel, his batman. With his dying words, Ponchel reveals he gained help from the German soldiers, visited his mother, and had coffee with her. He also informs Audebert that he has a young son named Henri. Audebert is punished by being sent to Verdun, and he receives a dressing down from his father, a general. In a culminating rant, young Audebert upbraids his father, expressing no remorse at the fraternisation at the front, and his disgust for civilians and superiors who talk of sacrifice but know nothing of the struggle in the trenches. He also informs the general about his new grandson Henri. Moved by this revelation, the general then recommends they "both try and survive this war for him". Horstmayer and his troops, who are confined in a train, are informed by the German Crown Prince that they are to be shipped to the Eastern Front, without permission to see their families as they pass through Germany. He then stomps on Jörg's harmonica and says that Horstmayer does not deserve his Iron Cross. As the train departs, the Germans start humming a carol they learnt from the Scots. (The carol in question, " L'Hymne des Fraternisés " / "I'm Dreaming of Home", is in fact a modern composition by Lori Barth and Philippe Rombi.)

In 1975, Ian Curtis and Debbie Woodruff marry in their home town of Macclesfield, south of Manchester, England, at ages 19 and 18 respectively. Ian retreats from domestic life, preferring to write poetry in solitude. On 4 June 1976 they attend a Sex Pistols concert with Bernard Sumner, Peter Hook, and Terry Mason, who are starting a band. Mesmerized by the concert, Ian volunteers to be their singer. They name themselves Warsaw, and Terry moves into a managerial role with the addition of drummer Stephen Morris. The band debuts on 19 May 1977 and soon rename themselves Joy Division. At year's end, Ian and Debbie finance the group's first EP, An Ideal for Living. During his job as an employment agent, Ian witnesses his client Corinne Lewis suffering an epileptic seizure. Unsatisfied with the brief mention Joy Division receives from television host Tony Wilson, Ian demands that he put the band on his programme. In April 1978 Joy Division plays a battle of bands, impressing Tony and Rob Gretton, who becomes their new manager. They perform " Transmission " on Tony's programme and sign to his Factory Records label; Tony signs the contract using his blood. In December 1978 Ian suffers a seizure on the way back from the band's first London gig. He is diagnosed with epilepsy and prescribed medications that leave him drowsy and moody. Learning that Corinne has died of a seizure, he writes " She's Lost Control " about her. He begins to neglect Debbie, who gives birth to their daughter Natalie in April 1979. Ian quits his job to go on tour, leaving Debbie to work and care for the baby. Ian admits to Belgian journalist Annik Honoré that he is miserable at home and considers his marriage a mistake. The two begin having an affair during Joy Division's January 1980 European tour. On returning home, Ian tells Debbie he is unsure if he still loves her. During the rehearsing of " Love Will Tear Us Apart ", Rob informs the band that they will be departing 19 May for a tour of the United States. Debbie finds evidence of Ian's infidelity and confronts him. He promises that the affair is over but continues to see Annik during the recording of Closer in Islington. Ian suffers a seizure mid-performance and is comforted by Annik, who admits she is falling in love with him. He attempts suicide by overdosing on phenobarbital but doctors save his life. He continues to perform but is exhausted by the strain and overwhelmed by the audience's expectations. At a performance at Bury's Derby Hall the stress proves too much and he is only briefly able to go onstage. The audience riots when Alan Hempstall of Crispy Ambulance steps in to cover for Ian and the gig is ruined. Ian tells Tony that he believes everyone hates him and that it is all his fault. When Debbie learns that Ian is still seeing Annik, she demands a divorce. Bernard attempts to use hypnotherapy on Ian, who then goes to stay with his parents. He writes to Annik admitting his fear that his epilepsy will eventually kill him and confesses that he loves her. On 17 May 1980, two nights before Joy Division is due to depart for America, Ian returns home and begs Debbie not to divorce him. When she refuses, he angrily orders her out of the house. After drinking alone and writing Debbie a letter, he has another seizure. Regaining consciousness the following morning, he hangs himself from the Sheila Maid in the kitchen. Debbie discovers his body and staggers into the street, crying for help. The news of Ian's death leaves the remaining Joy Division members stunned, while Tony consoles Annik. As Ian's body is cremated, the group gather in a café with Gillian Gilbert, foreshadowing the future of the band.

The film opens just as construction has been completed on a railway connecting mountainous regions of eastern Bosnia and western Serbia in 1992. Luka, a Serbian engineer, has moved to Bosnia from Belgrade with his mentally unstable wife, Jadranka, and his football-playing son, Miloš, to run a railway station and act as caretaker. Luka is at work preparing the opening of the railway while Miloš attempts to become a professional footballer with the Partizan team. Utterly engrossed in his work and blinded by natural optimism, Luka remains deaf to the increasingly persistent rumblings of war, which has broken out in Croatia and threatens to spread. When the conflict explodes, Miloš is denied his place on the football field when he is enlisted into the Serbian army, and Jadranka disappears on the arm of a Hungarian musician. Eventually, Luka receives news that Miloš has been taken prisoner of war. Luka considers suicide, but a profiteering acquaintance presents him with Sabaha, a Bosnian Muslim whom he has taken hostage. Luka intends to exchange Sabaha for Miloš, but the two fall in love after they are forced to flee deeper into Serb-controlled territory. When a UN-enforced prisoner exchange is finally arranged, Luka and Sabaha try to escape to Serbia at an attempt to cross the Drina river, but Sabaha is wounded by a Bosnian sniper after squatting to urinate behind a tree. Army nurses narrowly manage to save Sabaha's life, and she is exchanged for Miloš, along with other prisoners. Jadranka also returns, and the family is reunited in their old home, but Luka is lovesick. He lies down in front of a train, but when the train stops to avoid running over a mule, it is revealed that Sabaha is on board, and the two ride away on the mule.