Island police officer Onno Federsen is at a loss. On the otherwise peaceful island of Langeoog, a trapper is on the loose. The trap has already snapped twice. Who will be the next victim? And what is the story behind the human skull found by tourists at Flinthörn that disappears from police custody? The confusion is complete when it is allegedly reported that the man who drowned twelve years ago, Annemarie Hansen's husband, has been seen.