BTS
- Година: 1970
- Земја: Spain
- Genанр: Thriller, Mystery
- Студио:
- Клучен збор: behind the scenes, series of murders, locked door, arts school, school project, murder in school, locked inside
- Директор: Igor Morales
- Улоги: Néstor Seller, Juan Paya, Lucía Agustín, Irene Hickey, Candela del Olmo, Álvaro Galarza