George (Hoskins), a low-level working-class gangster recently released from prison, is given a job in London by his former boss, Denny Mortwell (Caine), as the driver and bodyguard for a high-priced prostitute named Simone (Tyson). Mortwell also wants George to gather information on one of Simone's wealthy customers for blackmail purposes. Simone, who has worked hard to develop high-class manners and an elite clientele, initially dislikes the uncouth and outspoken George, and he regards her as putting on airs. But as George and Simone find out more about each other, they form a friendship, and George begins to fall in love with her. George agrees to risk his own life to help Simone find her teenage friend Cathy (Hardie), who has disappeared, and whom Simone fears is being abused by her violent former pimp, Anderson (Peters).