Young scout Edwin was dropped off on a deserted island and tasked with collecting mushrooms and berries for a common cauldron. But a different kind of find awaited him - a bullet-ridden human skull. The inquisitive teenager realizes that he must immediately show it to his housemate and older friend, Police Commissioner Evert Bäckström. The official investigation begins with a genetic examination, which establishes the identity of the murdered woman. The result is shocking: this woman died twice! A less experienced investigator would have been baffled by this discovery, but not Bäckström. After all, he became famous as the best homicide investigator.