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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. Wikipedia