Apartment concierge Cesar is a miserable person who believes he was born without the ability to be happy. As a result, he decides his mission is to make life hell for everyone around him. A majority of the tenants are easy to agitate, but Clara proves to be harder than the most. So Cesar goes to creepy extremes to make this young woman mentally break down. Things get even more complicated in this twisted relationship when her boyfriend, Marcos, shows up.

Javier Falcón, Chief of the Sevilla Homicide Division, must solve two different cases in a short time. In the first case he is personally involved. An old friend of his infiltrated an Islamic terrorist cell and now the group is trying to recruit his young son for their cause. The same case hits even closer at home. A war is raging between two clans in the Russian Mafia. When an important mobster tries to defect, he gets killed in a car crash. On the scene, the police find an encrypted USB stick with highly explosive information. Then the son of Falcon’s girlfriend Consuelo is kidnapped. They are contacted by both Mafia clans claiming they have the kid and wanting to get their hands on the information. And both say they will kill him if Falcon doesn’t give them the stick