Two seemingly unrelated cases bring Germany and Sweden together to catch a serial killer. In Kiel, a man jumps into a bathing lake - and is impaled by bamboo sticks. For Borowski and Sarah Brandt, it is initially not clear whether it is the act of a madman who accidentally finds his victims. Or did someone want to punish the dead?

A desperate call alerted the Kiel police emergency number: "He's in my apartment. He just comes through the wall." But for Carmen Kessler, any help comes too late. The young woman is found brutally murdered in her apartment.

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