Dr. Forti carries out strange experiments, assisted by his son Pablo. They embark on an expedition to the jungle. Eight years later Forti returns without his son but strange things start to happen in the old house where they live.

Julio Cesar (Enrique Herrera), writer of soap operas, is very upset nerves. Dr. Jimenez (Alberto Galán) recommends an institution that will give he a therapy to cure these scares. To avoid exposure to bad publicity, is camouflaged by the pseudonym Justiniano Conquian . By chance, a taxidermist (Joaquin Pardavé) also named. His case is different: it is a millionaire heir heritage potential, but will only be legally recognized if it meets a peculiar condition in the will, having to spend a whole month in the gloomy castle Conquian, competing with other heirs of fortune. Dr. Jimenez is bribed by a cousin of Justinian to send the false Conquian scares Castle into thinking that is the sanatorium.