Lucia is a mature woman who maintains a relationship with the young John. When he is found murdered in a bullring with a nail stuck in his chest, Lucia is the prime suspect, it is believed that the motive for the crime was jealousy because it felt for her daughter Marta, which had also been seduced by John.
| Directing | José María Forqué | Director |
| Writing | Jaime de Armiñán | Writer |
| Writing | Vicente Coello | Writer |
| Writing | José María Forqué | Writer |
| Writing | Pedro Masó | Writer |
| Production | Pedro Masó | Producer |
| Sound | Adolfo Waitzman | Music |
| Camera | Juan Mariné | Director of Photography |
| Editing | Magdalena Pulido | Editor |
| Art | Carlos Viudes | Art Direction |
| Art | Antonio Simont | Set Decoration |
| Costume & Make-Up | Paloma Fernández Olea | Hairstylist |
| Costume & Make-Up | Francisco Ramón Ferrer | Makeup Artist |
| Costume & Make-Up | María Elena García | Assistant Makeup Artist |
| Costume & Make-Up | Carlos Nin | Key Makeup Artist |
| Production | José Alted | Production Manager |
| Production | Luis Laso | General Manager |
| Directing | Sinesio Isla | Assistant Director |
| Art | Tomás Fernández | Construction Coordinator |
| Art | Pedro Surribas | Assistant Set Decoration |
| Art | Ángel Masó | Property Master |
| Sound | Julio Calvo | Sound Assistant |
| Sound | Juan Otero | Sound Assistant |
| Sound | Jaime Torrens | Sound Engineer |
| Camera | Víctor Benítez | Still Photographer |
| Camera | Félix Mirón | Camera Operator |
| Camera | Diego Úbeda | Assistant Camera |
| Costume & Make-Up | Humberto Cornejo | Wardrobe Master |
| Editing | Ana Colmenares | Assistant Editor |
| Directing | Andrés Vich | Script Supervisor |
| Production | Ricardo Bonilla | Production Assistant |