Strange and terrible things are afoot and the police are helpless to stop them in this taut, complicated thriller. First a heart attack victim goes to the hospital and awakens to find limbs missing, and later, the body of a rape victim is found with two strange puncture wounds upon her wrist.
Meanwhile in Europe, a military officer is murdered by someone with inordinate strength. After another girl is murdered, Inspector Bellaver gets on the case. The trail of clues has many twists and turns and before he is led to the mysterious estate of Dr. Browning, another dies.
There he discovers that the insane scientist has engineered a master race of emotionless, mindless beings as part of an international conspiracy. Now Bellaver and his cohorts must somehow stop the doctor and his friends from taking over the world.
This marks one of only two features to include all three great horror actors Christopher Lee (as the head of British Intelligence), Peter Cushing (the leader of a fascist government) and Vincent Price (mad Dr. Browning) in the cast. (The second was 1983's House of Long Shadows).
Interestingly, except for one brief moment at the end with Lee and Price, the actors never appear in the same scene together here.