In Dublin, a young woman is brutally murdered in her home by a maniac that throws acid in her face and then slits her throat with a razor. Her mangled body is later discovered in the trunk of a limousine owned by the Swiss Ambassador Sobiesky (Anton Diffring).
The Ambassador, who was the dead woman's lover, refuses to cooperate with the police due to his diplomatic immunity. John Norton (Luigi Pistilli), an ex-cop famed for his brutal working methods, is brought in to help and gets too deeply involved when he starts an affair with the Ambassador's beautiful step-daughter, Helen (Dagmar Lassander). Meanwhile, the brutal killings continue...