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In this slightly garbled mystery story, Anna (Birgit Doll) works in a Munich detective agency as an assistant to Sam Schwarz (Armin Müller-Stahl) -- an inept private investigator and aspiring author -- and one day she decides to unravel a missing persons case herself. She travels to the Brittany seacoast and settles into the abandoned cottage that had been occupied by the now-missing Maria. After a short while in the cottage, Anna begins to suspect someone malevolent is out to murder her, and she deteriorates emotionally, even contemplating suicide. A friendly neighbor helps her out more than once, but the mystery of Anna's response to the cottage and of the missing Maria is not resolved until Sam Schwarz arrives from Munich and starts working on both cases.