A British novelist travels to Spain to visit his sister. However, when he arrives he discovers that she has been murdered by a gang of devil-worshiping bandits called the Devil's Cross.
| Writing | Félix Martialay | Writer |
| Sound | Ángel Arteaga | Original Music Composer |
| Writing | Gustavo Adolfo Bécquer | Novel |
| Directing | John Gilling | Director |
| Writing | Paul Naschy | Writer |
| Crew | Fernando Arribas | Cinematography |
| Editing | Alfonso Santacana | Editor |
| Writing | John Gilling | Writer |
