Juan and Sonia arrive at a large old house, an ideal place to raise their newborn son. When, one night before going to bed, they check the operation of the monitoring device installed in the baby's room, they discover that someone is sitting next to the crib.
| Directing | Álex de la Iglesia | Director |
| Production | Álvaro Augustin | Producer |
| Production | Julio Fernández | Producer |
| Production | Aitor Montánchez | Executive Producer |
| Costume & Make-Up | José Quetglás | Makeup Artist |
| Crew | Diego Rodríguez Lobalzo | Property Master |
| Writing | Jorge Guerricaechevarría | Screenplay |
| Production | Mamen Moya | Casting |
| Camera | José Luis 'Moti' Moreno | Director of Photography |
| Production | Carlos Fernández | Executive Producer |
| Production | Amaya Díez | Casting |
| Production | Santiago Gimeno | Executive Producer |
| Art | Biaffra | Art Direction |
| Writing | Álex de la Iglesia | Screenplay |
| Editing | David Pinillos | Editor |
| Editing | Alejandro Lázaro | Editor |
| Sound | Roque Baños | Original Music Composer |
| Production | Elena Manrique | Delegated Producer |
| Production | Belén Atienza | Delegated Producer |
| Editing | Chicho Ibáñez Serrador | Editorial Coordinator |
| Production | Félix Rodríguez | Production Director |
| Costume & Make-Up | María José Lebrero | Costume Designer |
| Sound | Antonio «Mármol» Rodríguez | Sound Recordist |
| Sound | Charly Schmukler | Sound Editor |
| Directing | Rodrigo Sancho | Assistant Director |
| Directing | Luis Moreno | Second Assistant Director |
| Directing | Domingo González | Script Supervisor |
| Directing | Juan Rueda | Script Coordinator |
| Production | David Jareño | Production Manager |
| Production | Rafael López de la Manzanara | Location Manager |
| Costume & Make-Up | Mª Nieves Sánchez | Hairstylist |
| Sound | Fabio Huete | Boom Operator |
| Lighting | Emiliano Merino | Gaffer |
| Camera | Ángel Gómez Martín | Key Grip |
| Sound | Manuel Corrales | Foley Artist |
