After separating from his wife, Leonard Parker (Cosby) quit the spy business and became a restaurateur. His wife refuses to speak with him, and his daughter, who changes her career more often than her clothes, has begun dating a man old enough to be Leonard's father! On top of it all, the government has asked him to come back and save the world again.

Chinatown, San Francisco, 1928. Former private detective Dashiell Hammett, a compulsive drinker with tuberculosis who writes pulp fiction for a living, receives an unexpected visit from an old friend asking for help.