Barcelona between 1917 and 1923. Is the era of gangsterism, during which gunmen clash between anarchists and thugs paid by The Patronal showed a shocking number of deaths. The confrontation between anarchists and workers of the factory owners Savolta arms worsens when Savolta family decides to end the rebellion hiring murderers hired and plotting to hide their illegal transactions with Germany. Adapted from the novel by Eduardo Mendoza.

The film depicts ten years of Catalan history, from 1899 with the defeat of the Spanish side in the Cuban War of Independence to the Tragic Week 1909.

Duran and his team of the fifth group are secret agents missioned by Inspector Peña to find and capture a gang of dangerous criminals who are planning a major hit.