Late one night, private investigator Philip Marlowe is visited by his close friend Terry Lennox, who asks for a lift from Los Angeles to the California–Mexico border at Tijuana, Mexico. Marlowe obliges. On returning home, Marlowe is met by two police detectives, who accuse Lennox of having murdered his rich wife, Sylvia. Marlowe refuses to give them any information, so they arrest him. After he is jailed for three days, the police release him, because they have learned that Lennox has committed suicide in Mexico. The police and the press seem to believe it is an obvious case, but Marlowe does not accept the official facts.