Thief is a 1981 neo-noir film written and directed by Michael Mann and based on the 1975 novel The Home Invaders: Confessions of a Cat Burglar by "Frank Hohimer" (the pen name of real-life jewel thief John Seybold). The film stars James Caan as the titular thief and Tuesday Weld as his girlfriend. It was Mann's directorial debut. Frank (James Caan) is a highly experienced jewel thief and hardened ex-convict who has a set structure to his life. With a pair of successful Chicago businesses (a bar and a car dealership) as fronts for his lucrative criminal enterprise, Frank sets out to fulfill the missing part of his life vision: a family beginning with Jessie (Tuesday Weld), a pretty cashier he has begun dating. After taking down a major diamond score, Frank's fence, Joe Gags (Hal Frank), is murdered for skimming off money -- pushed out of a 12th-story window. Barry (James Belushi), Frank's friend and associate making the pick-up, discovers that a shady plating company executive Gags was working for is responsible, a Mr. Attaglia (Tom Signorelli). In addition, $185,000 of Frank's fence money was lifted by Attaglia from Gags when he was killed. Frank demands his money back in a tense confrontation at Attaglia's plating company. This leads to a face-to-face meeting with Attaglia's employer, Leo (Robert Prosky), a high-level fence and Chicago Outfit boss.