A hypnotist/ventriloquist is murdered in his dressing room and the dummy seems to be the only witness to the murder.
A delivery man is blamed for the crime and is hunted by the police. Meanwhile another murder occurs and it looks like they may have a supernatural killer on the loose.
Eugenio Martin handles the directing chores very well and the murders come across as violent, brutal and well staged. There are many, many plot shifts and the film always keeps you guessing as to what is really going on and who is responsible.
The "Krimi" film was released in late 1962 by Constantine films, and they have always been a high quality distribution company, and turned out hundreds of these kinds of films.
The twist ending might just take you by surprise and if you enjoy these kinds of films, you really can't go wrong watching this one. The cast includes Jean Sorel, Margot Trooger and Mara Cruz.