The investigation of the murder of two policemen will pit Inspector Vivancos, a tough, hardened and incorruptible guy, against his superior, Lieutenant Pajarda.

In the middle of the first world war, Barcelona is the center of multiple operations related to war, although Spain is a neutral country.

Antonio Castro, Sinatra, is a fighter of life working in an old cabaret in Barcelona imitating Frank Sinatra, accompanied in his show by Groucho Marx, Marlene Dietrich and Lola Flores. But one day, the sky dresses in gray for him; his wife, who works as a waitress in the same place, decides to leave him.