A strangler is loose on a British estate, and he not only strangles his victims but brands an "M" onto their foreheads before he decapitates them.
| Directing | Harald Reinl | Director |
| Production | Artur Brauner | Producer |
| Writing | Gustav Kampendonk | Screenplay |
| Writing | Ladislas Fodor | Screenplay |
| Camera | Ernst W. Kalinke | Director of Photography |
| Writing | Bryan Edgar Wallace | Novel |
| Production | Eberhard Meichsner | Executive Producer |
| Editing | Walter Wischniewsky | Editor |
| Art | Werner Achmann | Production Design |
| Costume & Make-Up | Irms Pauli | Costume Design |
| Sound | Oskar Sala | Original Music Composer |
| Camera | Evo Dycke | Camera Operator |
