Italian naval secret agents acquire a British codebook and the Italian counter-espionage agents start tracking enemy agents working undercover in Italy and providing false information.
| Directing | Francesco De Robertis | Director |
| Writing | Francesco De Robertis | Screenplay |
| Editing | Eraldo Da Roma | Editor |
| Camera | Carlo Bellero | Director of Photography |
| Sound | Annibale Bizzelli | Original Music Composer |
| Writing | Francesco De Robertis | Story |
| Directing | Odoardo Fiory | Co-Director |
| Directing | Silvana Jachino | Second Assistant Director |
| Directing | Carla Fierro | Script Supervisor |
| Camera | Dino Reni | Camera Operator |
| Production | Mario Gabrielli | Unit Manager |
| Production | Giorgio Tedeschi | Production Assistant |
| Production | Guido Celano | Production Assistant |
| Costume & Make-Up | Virgilio Morosetti | Makeup Artist |
| Sound | Umberto Picistrelli | Sound |
| Editing | Marisa Mengoli | Assistant Editor |
| Art | Giorgio Bruschi | Production Design |
| Art | Emilio Zago | Set Decoration |
| Costume & Make-Up | Giovanna Natili | Costume Design |
| Production | Gino Rossi | Production Manager |
| Production | Turi Vasile | Producer |