Movie: Detour (1945)

After his girlfriend Sue has left for the West Coast, Al Roberts decides to join her and starts a journey hitchhiking westwards. When he finds a driver who'd given him a lift dead, he decides to get rid of the body and take the man's identity, fearing he'd be accused of murder if he would go to the police. However, Vera, a hitchhiking girl Al picks up, sees through him and starts blackmailing him into going along with her schemes which get him deeper and deeper into trouble.