A former San Francisco police detective juggles wrestling with his personal demons and becoming obsessed with the hauntingly beautiful woman he has been hired to trail, who may be deeply disturbed.

A wheelchair-bound photographer spies on his neighbors from his Greenwich Village courtyard apartment window and, despite the skepticism of his fashion-model girlfriend, becomes convinced one of them has committed murder.

On a family vacation in Switzerland, Bob (Leslie Banks) and his wife, Jill (Edna Best), become friendly with a man staying in their hotel. When the stranger is assassinated in their presence, the vacation turns dangerous. Before dying, the stranger passes along a secret to Jill. Then, to keep the couple silent, a band of foreign assassins kidnaps their daughter. Offered no help by the police, Bob and Jill hunt for their daughter as they try to understand the information that they have.