Johanna, a beautiful brunette, comes back to her father's house after accomplishing a training course in a car factory in Turin. At home, she reads a note her father had ensconced in the welcome bouquet of flowers: «You're back at last.» Then, she meets her best friend, Jasmin, and they go together to see their group of friends # all have grown up together by the lake. It comes up they have all received a message similar to her own. Next evening, these young persons are having a good time, dancing, flirting, drinking a lot, as a retarded person watches them, and evokes a memory of a similar evening years ago... Then, people start dying around, and in the peaceful lake that hides mysteries they share.
Unfortunately the movie Der Wannsee-Mörder is not yet available on HBO Max.
| Directing | Jörg Lühdorff | Director |
| Sound | Malte Zurbonsen | Sound Editor |
| Production | Stephan Barth | Executive Producer |
| Camera | Philipp Timme | Director of Photography |
| Writing | Tim Krause | Writer |
| Production | Martin Ganz | Producer |
| Editing | Jens Klüber | Editor |
| Sound | Stefan Korte | Sound Re-Recording Mixer |
| Costume & Make-Up | Ivo Strangmüller | Makeup Artist |
| Sound | Oliver Biehler | Music |
| Art | Gerald Damovsky | Production Design |
| Sound | Guido Zettier | Sound Designer |
| Production | Robert Stiemerling | Producer |
| Costume & Make-Up | Marion Boegel | Costume Design |
| Sound | Rene Mikan | Sound Mixer |
| Sound | Ingo Pusswald | Sound Editor |
| Production | Simone Bär | Casting |
