Single mother Sabine lives with her 18-year-old son Ilya at Kochelsee in Bavaria. Ilya wants to take some time out and go on vacation to Italy with his girlfriend Cora. But Cora suddenly disappears and Ilya goes to Italy alone. When Sabine discovers a buried cave in the mountains shortly afterwards, she finds Cora's body. She fears that Cora was unfaithful to Ilya and that he killed his girlfriend in the heat of the moment. Sabine does everything she can to divert suspicion away from her son. In desperation, she turns to the village policeman Asam. Sabine has no idea that she has made a fool of herself with him. While the police search for Ilya, Sabine discovers the secret of the intelligent but brutal village policeman. Is Asam himself the murderer in the end? Sabine's life is in danger.