IN A GLASS CAGE tells the story of an ex-Nazi sadistic child abuser named Klaus (Gunter Meisner) who is paralyzed and depending on an iron lung to live. A young man named Angelo (David Sust) who comes to nurse him was one of his victims years before. IN A GLASS CAGE was inspired by the true story of 15th Century French knight Gilles de Rais. IN A GLASS CAGE, a psychological horror thriller is considered Agusti Villaronga's Masterpiece.