Based on a true story. In the 70s, during the last stages of Franco's dictatorship, Txema, a basque construction worker, is arrested because of his connection to some terrorists who have just committed a murder. The secret service see in him an ideal candidate to infiltrate the terrorist band ETA and become a mole, so they try to offer him a deal if he will do so.
| Writing | Antonio Onetti | Writer |
| Directing | Miguel Courtois | Director |
| Production | Melchor Miralles | Executive Producer |
| Production | Julio Fernández | Executive Producer |
| Production | Miguel Torrente | Line Producer |
| Crew | Néstor Calvo | Cinematography |
| Sound | James Muñoz | Sound Editor |
| Production | Teresa Gefaell | Production Manager |
| Camera | Olivier Gallois | Camera Operator |
| Crew | Diego Herberg | Stunts |
| Sound | Ricardo Viñas | Dolby Consultant |
| Camera | Fernando Sancho | Still Photographer |
| Crew | Jesús L. Pérez Villar | Post Production Supervisor |
| Lighting | Arcadio Sequeira | Gaffer |
| Production | Américo Piñeiro | Casting |
| Visual Effects | Jesús Pascual | Visual Effects Supervisor |
| Art | Miguel Ángel Gómez | Painter |
| Crew | Leandro Muslera | Property Master |
| Costume & Make-Up | Paquita Núñez | Hairstylist |
| Costume & Make-Up | José Antonio Sánchez | Makeup Artist |
| Crew | Iván Marín | Sound Recordist |
| Lighting | Roberto Cuadrado | Electrician |
| Art | Leopoldo Báez | Construction Coordinator |
| Costume & Make-Up | Pedro Moreno | Costume Design |
| Editing | Antonio Álvarez | Color Timer |
| Crew | Manuel Casla | Carpenter |
| Sound | Tomás Erice | Boom Operator |
| Sound | Manuel Cora | Sound Mixer |
| Camera | José Ramón Delgado | First Assistant Camera |
| Crew | Ignacio Carreño | Stunt Coordinator |
| Production | Antonio Onetti | Casting |
| Crew | Javier Navasques | Video Assist Operator |
| Production | Sara Ramírez | Production Coordinator |
| Sound | Francesc Gener | Original Music Composer |
| Crew | Reyes Abades | Special Effects Coordinator |
| Art | Koldo Vallés | Art Direction |
| Costume & Make-Up | Victoria Velázquez | Costume Design |
| Directing | Elena Gil Nagel | Script Supervisor |
| Production | Julia Calurano | Publicist |
| Editing | Guillermo S. Maldonado | Editor |
| Production | Roberto Padilla | Unit Manager |
| Directing | Yan Angosse | Second Assistant Director |
| Camera | Ángel Gómez Martín | Key Grip |
| Directing | Carmen Torres | Third Assistant Director |
| Camera | Enrique Bello | Grip |
| Sound | Manuel Carrión | Sound Effects |
| Editing | Esperanza González | Negative Cutter |
| Directing | Manuel L. Cañizares | First Assistant Director |
| Writing | Alberto Marini | Story Editor |
| Editing | José Manuel Jiménez | Assistant Editor |
| Camera | Gontzal Domingo | Additional First Assistant Camera |
| Crew | José Ramón Astaburuga | Dialect Coach |
| Production | Xavier Camprecios | Additional Production Assistant |
| Production | Antonio Mendoza | Accountant |
| Costume & Make-Up | Cecilia Escot Mangas | Assistant Makeup Artist |
| Sound | Joan Cayuela | Music Producer |
| Production | Gonzalo Cañellas | Production Assistant |
| Costume & Make-Up | Dolores Plaza | Costumer |
| Directing | Jesús Liedo | Second Assistant Director |
| Art | Puri Adorna | Assistant Decorator |
| Sound | Manuel Carrión | Foley Artist |
| Sound | Jaime Climent | Sound Assistant |
| Production | Nicolás Lecocq | Controller |
| Camera | Juan Aragonés | Assistant Camera |
| Production | Paco Elías | Assistant Accountant |
