In Dublin, the acid-scarred, razor-slashed corpse of a young woman is discovered in the boot of the Swiss Ambassador's limousine. The Ambassador, his family and employees all become immediate suspects. Faced with the problem of diplomatic immunity, the police officer in charge of the case brings in John Norton, an ex-Inspector known for his brutal methods, to carry out an "unoffical" investigation. While Norton develops a relationship with the Ambassdor's attractive daughter, several more gruesome murders occur...
| Writing | Riccardo Freda | Screenplay |
| Writing | Richard Mann | Novel |
| Production | Fritz Hammel | Unit Manager |
| Production | Giuseppe Bruno Bossio | Production Secretary |
| Sound | Stelvio Cipriani | Original Music Composer |
| Editing | Riccardo Freda | Editor |
| Production | Alfonso Donati | Production Manager |
| Sound | Nick Alexander | Sound Re-Recording Mixer |
| Writing | Günter Ebert | Screenplay |
| Writing | Renato Romano | Screenplay |
| Editing | Bruno Micheli | Assistant Editor |
| Directing | Riccardo Freda | Director |
| Production | Giuseppe Chevalier | Production Designer |
| Art | Giuseppe Chevalier | Art Direction |
| Costume & Make-Up | Nadia Vitali | Costume Designer |
| Camera | Mario Mazzoni | Still Photographer |
| Production | Franco Fumagalli | Unit Manager |
| Directing | Leo Jahn | Assistant Director |
| Writing | Sandro Continenza | Screenplay |
| Camera | Leo Massa | Still Photographer |
| Editing | Gertrud Petermann | Assistant Editor |
| Production | Ennio Nobili | Producer |
| Sound | Aldo De Martino | Sound Engineer |
| Camera | Ennio Marzocchini | Assistant Camera |
| Writing | André Tranché | Dialogue |
| Production | Robert Dorfmann | Co-Producer |
| Camera | Silvano Ippoliti | Director of Photography |
| Costume & Make-Up | Lamberto Marini | Makeup Artist |
| Camera | Renato Doria | Assistant Camera |
| Directing | Vivalda Vigorelli | Continuity |
| Camera | Enrico Sasso | Camera Operator |
