A young policemen witnesses a bank robbery which will become his first case. To catch the thieves he will infiltrate himself as one of the gang members. At first it works, but it won't be so easy afterwards.
| Directing | Ignacio F. Iquino | Director |
| Writing | Manuel Bengoa | Writer |
| Writing | Juan Lladó | Writer |
| Writing | José Santugini | Writer |
| Production | Ignacio F. Iquino | Producer |
| Sound | Augusto Algueró | Music |
| Camera | Pablo Ripoll | Director of Photography |
| Editing | Ramón Quadreny | Editor |
| Costume & Make-Up | Manuel Manteca | Makeup Artist |
| Production | Ambrosio Aznar | Unit Production Manager |
| Production | Aureliano Campa | Production Manager |
| Production | Fernando Renau | Unit Production Manager |
| Directing | Juan Lladó | Assistant Director |
| Directing | Javier Setó | Assistant Director |
| Camera | Antonio García | Second Assistant Camera |
| Camera | Pedro Rivera | First Assistant Camera |
| Directing | Juliana San José de la Fuente | Script Supervisor |
| Production | Amadeo Viñals | Production Assistant |