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A 21-year-old woman lives in a small town. As she often does, she goes for an evening walk. Shortly afterward, she is dead: brutally murdered. A sexual motive is likely.

A passerby discovers a partially buried suitcase containing a body. The victim's identity is initially unclear. The police contact the television program "Aktenzeichen XY... Ungelöst" (Case File XY... Unsolved).

A seven-year-old girl disappears on her way to school. Twelve days later, her body is found in a pond. The child was sexually abused before her death.

An unknown man is hunting women. For years, he has sought out his victims on the street, stalking and attacking them. Police have attributed nearly 60 cases to him.