A séance is attended by the ghost of a woman's dead husband. The woman is a friend of the McMillans, and they they leap into action to rescue her sanity and her life.

A composer/pianist whose latest work is dedicated to Sally is stabbed in his apartment which contains items that point to a relationship with her, although she had not met him previously.

Sergeant Enright's abusive ex-wife is shot while locked in a room alone with him, and the bullet that kills her came from his gun--a weapon he was holding at the time of the shooting.

The mob doesn't want a man named Benson to testify. To prevent this, they kidnap Mac and replace him with a shady lookalike to impersonate him.

Sally is the victim of a purse-snatcher. But when her purse is returned, and the thief is found dead, Mac realizes Sally has a secret admirer with a deadly obsession.

Sally is kidnapped by an international syndicate that is after a Rembrandt painting currently on loan to the San Francisco Art Museum from the Prado.

Someone seems to want Sally's Uncle Cyrus dead. Mac and Sally are in a race to find who wants him dead before it's too late.