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The Net

United States Under Secretary of Defense Michael Bergstrom commits suicide after being informed that he has tested positive for HIV.

The relationships of freelance Venice, Los Angeles systems analyst Angela Bennett are almost completely online and on the phone, with the exception of forgettable interactions with her neighbors and visits to her mother, who is institutionalized with Alzheimer's disease and often forgets who she is. Angela's co-worker Dale, in San Francisco, sends her a floppy disk of the band website "Mozart's Ghost" with a backdoor labeled " π " that permits access to a commonly used computer security system called "Gatekeeper" sold by Gregg Microsystems, a software company led by CEO Jeff Gregg. Angela and Dale agree to meet the next morning, as he is planning on taking his own plane, but the navigation system in Dale's private aircraft malfunctions and the plane crashes, killing him.

Angela travels to Cozumel, Mexico, on vacation, where she meets Jack Devlin. After seducing Angela, Devlin pays a mugger to steal her purse. He chases the mugger, catches him, and roots through the purse to find the disk before shooting the mugger dead. The robber takes Angela out on his speedboat to kill her as well, but she finds his gun and confronts him. While fleeing with the disk and Devlin's wallet, Angela's dinghy collides with rocks, knocking her unconscious.

Three days later, Angela finds that the disk was ruined by the sun and all records of her life have been deleted. Because none of the neighbors remember her, they cannot confirm her identity. Angela's Social Security number is now assigned to Ruth Marx, for whom Devlin has entered an arrest record. When Angela calls her own desk at Cathedral Software, Ruth, impersonating her, answers and offers her old life back in exchange for the disk. She contacts the only other person who knows her by sight, psychiatrist and former lover Alan Champion. He checks her into a hotel, offers to contact a friend at the FBI, and arranges to have her mother moved for her safety.

Using her knowledge of the backdoor and a password found in Devlin's wallet, Angela logs into the Bethesda Naval Hospital 's computers and learns that Under Secretary of Defense Bergstrom, who had opposed Gatekeeper's use by the federal government, was murdered by altering the results of his HIV test, leading to a misdiagnosis. Fellow hacker "Cyberbob" connects π with the "Praetorians", a group of cyberterrorists linked to recent computer failures around the country. Angela and Cyberbob plan to meet, but the Praetorians intercept their online chat. Angela escapes from Devlin, who is revealed to be a contract killer for the cyberterrorists, but the Praetorians kill Champion by tampering with pharmacy and hospital computer records. After Angela is arrested by the California Highway Patrol, a man identifying himself as Champion's FBI friend frees her from jail. She realizes he is an impostor and escapes again, resulting in the impostor's death in a car crash.

Now wanted for murder and thought to be Ruth, Angela hitchhikes to Cathedral's office where, using Ruth's computer, she connects the cyberterrorists to Gregg Microsystems and uncovers their scheme: once the Praetorians sabotage an organization's computer system, Gregg sells Gatekeeper to it and gains unlimited access through the backdoor. Angela emails evidence of the backdoor and Gregg's involvement with the Praetorians to the FBI from the Moscone Center and tricks Devlin into releasing a virus into Gregg's mainframe, destroying Gatekeeper and undoing the erasure of her identity. During a battle on the catwalks of the convention center, Devlin accidentally shoots Ruth dead, but Angela ambushes him, causing him to fall to his death. Regaining her identity and life, Angela reunites with her mother, and the conspiracy is exposed, with Gregg being arrested by the FBI.