Ten people are invited to a hotel in the Iranian desert, only to find that an unseen person is killing them one by one. Could one of them be the killer?
| Directing | Peter Collinson | Director |
| Writing | Agatha Christie | Novel |
| Camera | Fernando Arribas | Director of Photography |
| Production | Harry Alan Towers | Producer |
| Writing | Erich Kröhnke | Writer |
| Writing | Enrique Llovet | Writer |
| Writing | Harry Alan Towers | Writer |
| Production | Alain Dahan | Producer |
| Production | Alexander Grüter | Executive Producer |
| Editing | Gabrielle Reinecke | Editor |
| Editing | John Trumper | Editor |
| Art | José María Tapiador | Production Design |
| Costume & Make-Up | Louis Bonnemaison | Makeup Artist |
| Costume & Make-Up | Cristóbal Criado | Makeup Artist |
| Production | Harry Benn | Associate Producer |
| Production | Juan Estelrich March | Associate Producer |
| Production | Ennio Nobili | Co-Producer |
| Production | Tíbor Reves | Associate Producer |
| Sound | Bruno Nicolai | Original Music Composer |
| Sound | Carlo Rustichelli | Original Music Composer |
| Costume & Make-Up | Ana Criado | Hairstylist |
| Costume & Make-Up | Luis Criado | Assistant Makeup Artist |
| Production | Juan Estelrich March | Production Manager |
| Production | Ángel Sevillano | Production Assistant |
| Crew | Nicholas Wentworth | Post Production Supervisor |
| Directing | José López Rodero | Assistant Director |
| Directing | Stefano Sbarigia | Assistant Director |
| Sound | Mike Le Mare | Sound Editor |
| Sound | Peter Offer | Sound Assistant |
| Sound | Trevor Pyke | Sound Re-Recording Mixer |
| Sound | Wilhelm Schmidke | Sound |
| Sound | Ivan Sharrock | Sound Mixer |
| Crew | Emilio Ruiz del Río | Special Effects |
| Lighting | Julio Leyva | Lighting Technician |
| Camera | Mario Mazzoni | Still Photographer |
| Camera | Eduardo Noé | Camera Operator |
| Camera | Javier Pérez Zofio | Assistant Camera |
| Camera | Ramón F. Suárez | Additional Director of Photography |
| Editing | Michael Crowley | Assistant Editor |
| Editing | María Luisa Pino | Assistant Editor |
| Sound | Bruno Nicolai | Conductor |
| Directing | Susanna Merry | Continuity |
| Production | Charles Athey | Production Accountant |
