Paul Naschy has a duel role as Amenhotep/Assad Bey, an ancient egyptian mummified Pharaoh, and the high priest who brought him back to life. In order For Amenhotep to achieve immortality, Assad Bey has to kidnap nubile young virgins in Victorian London for blood sacrifices.

A policeman infiltrates in a gang of forgers. He and their leader fought together in Vietnam, where he saved his life. The policeman arrives to the gang headquarters, a mansion in the Californian coast, and thinks everything is under control, until some unexpected visitors, a gang of deranged hippies, show him he is wrong.

Although the title (which translates as "Murders in Chicago") promises a gangster story, this is more of a murder mystery that kicks off with the seemingly accidental death of a construction worker, followed shortly after by that of a noted publisher (an uneasy-looking Eduardo Fajardo). What follows is a very confusing story in which the police, a police coroner (José Campos) and a vagrant (Fernando Sánchez Polack) who witnessed Fajardo's death embark on separate inquests on what actually happened. Meanwhile, June (María Luisa Rubio), who works as a secretary for the publishing company, is under pressure by a blackmailer (Antonio Jiménez Escribano) who has pictures of her in the sack with the deceased publisher.

After marrying a rich heiress, a young man from humble origins is dedicated to looking for coal in the surroundings of Gijón.