Everything you ever wanted to know about the film that changed the pulse, pace, tone, perspective, camera work and landscape of Spanish horror films, and not that you were afraid to ask, but that you never found the right moment to ambush Balagueró and Plaza, Manuela Velasco, the director of photography Pablo Rosso and the Filmax producer (this one's for you, Julio!) and subject them to a fierce interrogation. Don't worry. The time has come. The great Diego López-Fernández, the true heir to the Beast, platonic lover of Helga Liné, treats us to this documentary, which will be studied in film school. The production involves, among others, a woman of countless deeds and an interesting surname, Nadine Rothschild.