In the fifties, inspector Mascarell and his wife, Patro, are going to become parents in a Barcelona that suffers a period of social agitation because of the raise of the train’s pric...

In the fifties, inspector Mascarell and his wife, Patro, are going to become parents in a Barcelona that suffers a period of social agitation because of the raise of the train’s prices.

One day, Pere Humet, an old Mascarell’s subordinate, tells him that Piñol, Arnella and Matarrodona, three policemen that were under his orders too, went together to the exile, to the refugee camp in Argelès, and then they worked in the Maginot Line, until the Germans sent them to Mauthausen. They survived that hell, but the caprice of a German authority unchained the horror: he forced Piñol to kill Arnella and to do the same with Humet, but the gun only had one shot so he saved his life, but he swore he would revenge Piñol, who started to collaborate with the germans.

Humet explains Mascarell that he returned because he knows that Piñol is in Barcelona. He also confessed that he has cancer, and has not much time left.

Miquel accepts to help him, but one day he discovers Humet’s dead body next to his cousin. Nicolás, the cousin’s ex-boyfriend is accused of the crime, but Miquel is sure that the killer is Piñol and that he must find him.