In Dublin, the acid-scarred, razor-slashed corpse of a girl is uncovered in the boot of the Swiss Ambassador's limousine. The Ambassador, his family members and workers all become prompt suspects. Confronted with the issue of diplomatic immunity, the police officer in charge of the case brings in John Norton, an ex-Inspector recognized for his ruthless techniques, to accomplish an "unoffical" investigation. While Norton establishes a partnership with the Ambassdor's attractive little girl, numerous much more gruesome murders happen ...