Castilla Films

London, England, World War II. During a bombing, several people are trapped in the basement of a building where the air will run out in only ninety minutes.

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.

The creative and ambitious Carlos, a young Spanish film buff, manages to become a professional camera operator with time and effort, and is also blessed with the love of Ana, which he has longed for; but the outbreak of the Civil War in 1936 changes everything for both of them.