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.
Karin Dor
as Claridge Dorsett
Harry Riebauer
as Inspector Jeff Mitchell
Ingmar Zeisberg
as Judy
Walter Giller
as Lord Edgar Blackmoor
Rudolf Fernau
as Lucius Clark
Hans Nielsen
as Tavish
Dieter Eppler
as Anthony, the butler
Hans Reiser
as Mike Pierce
Richard Häussler
as Dr. Tromby
Albert Bessler
as Gärtner Sebastian
Peter Nestler
as Tom
Gerhard Hartig
as Watson
