Klara is going to die today unless she kills her husband instead. The Calendar Killer has given her that impossible choice. When Jules starts his night shift at a telephone safety helpline for lonely women on their way home, Klara's call reaches him. He soon becomes her last hope for survival and races against time to save her.
Unfortunately the movie The Calendar Killer is not yet available on HBO Max.
| Writing | Sebastian Fitzek | Book |
| Writing | Susanne Schneider | Screenplay |
| Directing | Adolfo J. Kolmerer | Director |
| Production | Regina Ziegler | Producer |
| Production | Barbara Thielen | Producer |
| Production | Susa Kusche | Producer |
| Camera | Christian Huck | Director of Photography |
| Art | Thomas Freudenthal | Production Design |
| Production | Tillman Geithe | Producer |
| Production | Philip Pratt | Producer |
| Production | Verena Schilling | Producer |
| Sound | Tim Schwerdter | Music |
| Sound | Román Fleischer | Music |
| Editing | Laura Wachauf | Editor |
| Production | Ana Dávila | Casting |
| Art | Christian Pralle | Art Direction |
| Art | Marése Müller | Set Decoration |
| Art | Johanna Maul | Set Decoration |
| Art | Iraí Amana Martins de Souza | Set Decoration |
| Costume & Make-Up | Anne-Gret Oehme | Costume Design |
