Siegfried Lowitz

Having doubts about the guilt of the obvious suspect in the murder of an eight-year-old girl, a police detective investigates the case on his own.

The sister of the criminal named "Hexer" is murdered. Scotland Yard Inspector Higgins believes that the criminal will surface to take his revenge and plans to set a trap to finally capture him. However, bodies soon start piling up.

Scotland Yard and an American playboy investigate a criminal gang led by a mysterious man in a frog-like mask.