[3][4][5] The American prints have an additional short credit sequence that was filmed in the USA, slightly different from the other versions.

[2] A young dancer named Mara calls at a pharmacy moments after the murder of the pharmacist inside, but the killer prevents her access by holding the door shut.

Fearing she knows too much, the perpetrator soon makes an attempt on her life, causing her to move in with her boyfriend, Lukas, for protection.

Several other people begin turning up murdered, one having her head forced into an oven and another strangled in a bathtub.

Lukas later learns the trail of clues leads back to World War II and events involving a group of Nazi collaborators.