August 1936, the beginning of the Spanish Civil War. 51 members of the Claretian community of Barbastro (Huesca) are martyred, die for their faith. The film recounts the last weeks of his life, since they are held until they are finally shot. During that time, they perform various writings they talk about their situation, of his fellow captives, people who saw them. These writings have been the basic testimony used to narrate this real fact in film version.
| Directing | Pablo Moreno | Director |
| Writing | Juanjo Díaz Polo | Writer |
| Sound | Sergio Cardoso | Music |
| Crew | Rubén D. Ortega | Cinematography |
| Editing | María Esparcia | Editor |
| Production | Jacobo Muñoz | Casting |
| Costume & Make-Up | Patricia Azpeleta | Costume Design |
| Costume & Make-Up | María Gómez Rodríguez | Makeup Designer |
| Costume & Make-Up | Cristina Martín | Hairstylist |
| Production | Noelia Amaro | Assistant Production Manager |
| Production | Raúl Carrillo | Assistant Production Manager |
| Production | Gonzalo Fernández | Assistant Production Manager |
| Production | Sandra Gumuzzio | Assistant Production Manager |
| Production | Paco Pavón | Production Manager |
| Directing | Daniel «El Lobo» Blasco | Assistant Director |
| Directing | Anna Rodríguez | Second Assistant Director |
| Art | Aránzazu Gaspar | Art Department Manager |
| Sound | Roberto Alonso | Boom Operator |
| Sound | Idoia Iñarritu | Sound |
| Sound | Jofre Llivina | Sound |
| Camera | Rubén D. Ortega | Camera Operator |
| Camera | José María Vicente González | Assistant Camera |
| Production | Sergio Morán | Extras Casting |
| Production | Bárbara Rodríguez | Casting |
| Directing | María Esparcia | Continuity |