After an eight-month stay in a mental hospital, a tormented man comes home to live with his sister; but a mysterious boarder may be trying to kill him.

When the Great Northeast Blackout of 1965 hit, millions of people were left in the dark, including Waldo Zane, a New York executive in the process of stealing a fortune from his company, and two people whose paths he’s destined to cross, Broadway actress Margaret Garrison and her husband, Peter.

Poor Major Minor is disgraced and kicked out of the Adventurer's Club because he has never captured Snagglepuss. The Major decides to use Snag's passion for acting against him, and he mounts a road show, which fools the mountain lion. Successful at last, the Major drives his captive directly to the Adventurer's Club stage, but Snagglepuss outwits him when he asks permission to do a farewell performance.