Julio, an only child belonging to a wealthy family, murders a prostitute who tries to seduce him. He, in childhood, suffered severe trauma and this causes serious problems with women. Because of this, runs away and stays in a boarding house in Madrid, where he meets Monica, the daughter of the owner, who maintains relationships that seek to build on for help in their desperate situation. As his obsession for killing is increasing.
Unfortunately the movie The Killer Is Not Alone is not yet available on HBO Max.
| Directing | Jesús García de Dueñas | Director |
| Art | Pablo Runyan | Production Design |
| Writing | Jesús García de Dueñas | Screenplay |
| Art | Ángel Arzuaga | Set Decoration |
| Camera | Fernando Arribas | Director of Photography |
| Production | Andrés Vicente Gómez | Producer |
| Writing | Jesús Torbado | Screenplay |
| Editing | José Antonio Rojo | Editor |
| Costume & Make-Up | Pilar Leonor | Seamstress |
