Officers McCarren and Rado get involved with Gideon King, a former friend who pilfered some jewels from a group of master thieves. The friend, a veteran private eye, heists a diamond cache.

The killing of a playboy bachelor puts McCarren and Rado on the trail of a ruthless murderer. Rado and McCarren's probe into the murder of a swinging bachelor leads them into a case involving a series of robberies.