Nancy's vacation at her aunt's San Francisco mansion takes a nightmarish turn when she is attacked by a mysterious thief of ancient jade figurines. Her assailant's vows to kill her are very nearly successful more than once. Can she trust the stranger who has been following her ever since her arrival in the city, even though his intervention saves her life? Then she must contend with a murder she is powerless to stop, and the return of her father, who she'd been told had died when she was a child ...