Rent The Big Switch (1968)

Cult filmmaker Pete Walker (Frightmare, House of Whipcord) directs this crime drama centring on a playboy gambler who has a passionate one-night stand with a beautiful woman. During the night, he briefly leaves and when he returns, finds her dead. Not wanting his name in the papers, the man tries to avoid the police. He soon finds himself victimized by extortionists, headed by his own boss and the girl, who only feigned death. They try to force him into breaking a notorious crime lord out of prison, but he is not so easily swayed.