The young woman, who was found floating lifeless in Lake Constance and pulled from the water by a fisherman, was apparently the victim of a romantic tragedy. Nadja Koch was strangled by her secret lover, Dennis Böhm, following a heated argument.

The Mafia on idyllic Lake Constance? Together with her Swiss colleague, Captain Aubry, Nele is working around the clock to investigate organized crime after two water police officers were murdered. An initial lead points to Pucci, an Italian shoe dealer who is believed to be a member of the Calabrian Mafia.

Lake Constance is considered Europe's largest ship graveyard. As a result, it attracts treasure hunters from all over the world. And that's exactly the kind of treasure hunter the WaPo spots on its patrol. Diver Arno Gierke admits that he misses both his partner and his boat.