A slick young man buys a jewel with a cheque that bounces. He then disappears and both the police and a lawyer try to find him. The lawyer hires a female detective to track down the missing man, but when his body is found in the Thames the case is by no means over.

After discovering the body of a murdered female agent in their trendy Soho, London nightclub, groovy owners Charles Salt and Christopher Pepper partake in a fumbling investigation and uncover an evil plot to overthrow the government. Can our cool, yet inept duo stop the bad guys in time?