Under mysterious circumstances, the restorer Lukas Albrecht drowns in the Canale dei Marani in Venice. While the easy-going Commissario Santo sees no criminal offense, the victim's widow resents the details. Anna, who is traveling from Vienna with her eleven-year-old son, doesn't believe it was an accident: her husband didn't have any alcohol in his blood, he knew the lagoon and could swim
Martin and Katharina’s marriage is at stake because their six-year-old son, Tobias, is autistic. They become friends with the young couple that moves in next door and Tobias starts to gradually open up. His parents are very happy. But soon Martin discovers that the young couple has their own reasons for wanting to be near Tobias: they have a horrible plan.
