Tras el cristal (English: In a Glass Cage) is a 1987 Spanish art house horror film written and directed by Agustí Villaronga and starring Günter Meisner, Marisa Paredes and David Sust. The plot follows an ex-Nazi sadistic child abuser who is now paralyzed and depending on an iron lung to live. A young man who comes to nurse him was one his former victims years before. The film was inspired by the history of Gilles de Rais. With its theme mixing Nazism, pedophilia, torture and homosexuality, the film was highly controversial.
Klaus, a former Nazi German doctor who practiced horrific experiments with children during World War II, has continued with his sick attraction for torturing and killing young boys during his exile in a remote village in Catalonia. His latest victim is a child he has tortured and later kills with a blow to the head, taking photographs of the crime. This sadistic act has been witnessed by Angelo, another of Klaus victims, who has spied him from a window, later stealing the tortured incriminating writings and photographs of the doctor's crimes. Klaus tries to commit suicide jumping from a tower, but he survives. As a result of his failed attempt he is now unable
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