After a nuclear war on Earth, the Soviet Union and the U.S. both establish outposts on the moon. When a murder occurs on the outpost, both U.S. and Soviet investigators are forced to work on the case together.

After restaurateur Sam Wong dies in a telephone booth after making a call, law clerk Elaine Choi is tasked with executing his will. In order for the will to be valid, it needs to be signed by its recipients, but Choi finds that each of them are reluctant to do so.

Chinese British Detective Sergeant John Ho solves cases in the East End of London. Ho fits the pattern of the maverick detective, prepared to use unorthodox methods to solve his cases, which emerged in series like Z Cars and The Sweeney.