A black man (Davis) named Salt and his white partner (Lawford) named Pepper own a Soho nightclub. When a man and woman are murdered at the club, the partners are pointed to as the killers by an anonymous source. They finally are released and find themselves caught up in the middle of some
intrigue. The dead woman was a British secret service agent. Davis and Lawford find her diary with the names of four men marked for murder. They turn amatuer sleuths to try to solve the crimes, but three men are murdered. The trail leads to Le Messurier, a madman who wants to overthrow the English
government using nuclear blackmail. Davis and Lawford can't get anyone to believe th...