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House of Games
Psychiatrist Margaret Ford has achieved success with her recently published book about obsessive-compulsive disorder, but feels unfulfilled. Her patient, Billy Hahn, says his life is in danger because he owes money to a criminal figure named Mike Mancuso. He threatens suicide, brandishing a gun. Margaret persuades him to surrender the weapon to her and promises to help him.
That night, Margaret visits a pool hall called House of Games where she confronts Mike. He is willing to forgive Billy's debt if Margaret accompanies him to a back-room poker game and watch for the tell of George, another player: he plays with his ring when he bluffs. She agrees, and notices George playing with his ring after making a big bet. She discloses this to Mike, who calls the bet. However, George wins and demands that Mike pay the $6,000 bet, which he is unable to do. George pulls a gun, but Margaret intervenes and offers to pay the debt with a personal check. She then notices the gun is a water pistol, and realizes the entire game is a confidence trick for her money. She declines to pay, but spends the rest of the night socializing with the con men. The experience excites her and she returns the next night. She asks Mike to teach her about con games so she can write a book about it. Mike appears skeptical, but agrees.
Margaret is enchanted by Mike showing her simple con tricks. Eventually, the two sneak into a hotel room and have sex. Afterward, Mike tells Margaret that con artists take a small token from every "mark" to signify their dominance. While Mike is in the bathroom, she takes a small pocket knife belonging to the room's occupant. Mike says he is late for another large-scale con that he and his associates are planning at the same hotel. Mike reluctantly allows her to tag along, posing as his wife. The con involves Mike, his partner Joey, and the "mark", a businessman, discovering a briefcase full of money and taking it to a hotel room. They discuss whether to turn it in or split it among themselves. When the "mark" withdraws to the bathroom, Margaret discovers that he is an undercover cop part of a sting operation. She warns Mike, and they attempt to escape, but the cop tries to arrest them. After a struggle, Margaret accidentally causes the cop to fatally shoot himself. She, Mike, and Joey escape to the garage, where they force Margaret to steal a car and drive past two uniformed police officers with the con men concealed in the back seat. They drive the car to a riverbank and are preparing to abandon it when they discover that the briefcase, containing $80,000 borrowed from the Mafia for the con, is gone. Margaret offers to give Mike $80,000 of her own money so he can repay the mob.
Mike tells Margaret they must split up to avoid any police attention, and claims to be going into hiding. Riddled with guilt, Margaret returns to her office and refuses to see any patients. Billy arrives in high spirits, and after a brief conversation, she spots him driving away in the same red convertible that she "stole" at the hotel. She tracks him to a bar and sees Mike, all his associates, the man posing as the hotel guest, and the fake undercover policeman, discussing the night's events - a scheme to con Margaret out of $80,000. She also learns that the pocket knife she stole from the hotel room belongs to Mike, who set up the room to appear occupied. He mocks Margaret for stealing it.
After overhearing Mike is going to the airport that night, she intercepts him there and says she is so worried about the police that she has withdrawn her entire life's savings. In a non-public area, she pleads with him to start a new life with her. Mike is lured by the money, then realizes he is being tricked when she inadvertently reveals she overheard the con men discussing the pocketknife. He says her money is gone, but she pulls out Billy's gun and demands that he beg for his life. Disbelieving her, Mike refuses, but Margaret shoots him in the leg. When Mike curses her, she shoots him five more times, killing him. She calmly conceals the gun and leaves.
Some time later, Margaret has returned from a vacation, she has written another successful book, and is meeting her friend and colleague Dr. Littauer. They talk over lunch, and Margaret says, "When you've done something unforgivable, you must forgive yourself, and that's what I've done, and it's done". While her friend is away from the table, Margaret distracts another diner and steals a gold lighter from her purse, relishing the thrill.