A child is witness to an assault on a monk by the gang of Lorenzo the Fifth. The monk escapes and takes refuge in the estate of Doña Carlota, a countess who lives with her son Juan and daughter Beatriz. Basilisa, the maid, conjures the devil to free her son from an irreversible illness, but to do so the evil must be transmitted to an innocent soul, and for that she chooses Beatriz. The child begins to be the victim of a possession, for which everyone blames the monk.
Unfortunately the movie Beatriz is not yet available on HBO Max.
| Directing | Gonzalo Suárez | Director |
| Production | José S. Vaquero | Line Producer |
| Costume & Make-Up | Antonio Muñoz | Costume Designer |
| Art | José Luis Merino | Property Master |
| Costume & Make-Up | Juana Ramírez | Costumer |
| Lighting | Fernando López | Gaffer |
| Art | Alberto Corazón | Title Designer |
| Writing | Ramón del Valle-Inclán | Story |
| Production | Luis Méndez | Producer |
| Writing | Santiago Moncada | Screenplay |
| Production | Julián Esteban Gómez | Producer |
| Camera | Carlos Suárez | Director of Photography |
| Camera | César Cruz | Still Photographer |
| Camera | Fernando Fernández | Assistant Camera |
| Sound | Fermín Gurbindó | Original Music Composer |
| Costume & Make-Up | Toñy Nieto | Makeup Artist |
| Costume & Make-Up | Josefa Pérez | Hairstylist |
| Crew | Pablo Pérez | Special Effects |
| Writing | Gonzalo Suárez | Screenplay |
| Editing | Antonio Gimeno | Editor |
| Art | Ramiro Gómez | Set Decoration |
| Camera | Julio Madurga | Camera Operator |
| Costume & Make-Up | Carlos Nin | Key Makeup Artist |
| Art | José Luis del Barco | Assistant Set Decoration |
| Directing | Rodolfo Medina | Assistant Director |
| Directing | Marisa Ibarra | Script Supervisor |
| Production | José Garijo | Production Assistant |
| Sound | Jesús Jiménez | Sound Mix Technician |
| Costume & Make-Up | Marina Pavía | Assistant Makeup Artist |
| Editing | Mercedes Gimeno | Assistant Editor |
| Camera | Alberto Vega | Second Assistant Camera |
| Editing | Ricardo Gimeno | Assistant Editor |
