Melilla. Tangiers. Toulouse. In the dark of night, officers from the Spanish, Moroccan and French police forces carry out a synchronized anti-jihadist strike but retaliation looms.

Lack of resources and pressure to catch terrorists increases tensions within La Unidad, whose members also have to deal with the personal problems caused by their exhaustive dedication to police work.

The unexpected disappearance of Myaz sets off the alarms at the Unit. Their spy was based in Salt, near Badalona (Catalonia), so Marcos focuses his team's efforts in that region.

Marcos heads the party that searches for the two terrorists all over he area. Now that the fugitives no longer have any weapons or any logistic support, he thinks that they'll soon catch them.

After Ghareeb is dead his son seeks revenge while Carla have a big confession to say to Marcos about her disease.

Carla finds out that there are certain political forces, pressures and scheming at work to replace her as leader of the case and head of the Unit.

After more than a year of intense searching, the unit led by Chief Commissioner Carla Torres has arrested one of the most wanted jihadist leaders. But this operation sets in motion a revenge plan agai…

Touched by the revenge unleashed against them, the members of the Unit look for a way to protect themselves while going after the members of the terrorist cell, who have not yet completed their plan o…

Marcos is attacked while Lua sleeps in her room. Aware that everyone can be a target, they assign a police escort to all the members of the Unit, who must also face the fact that there could be a mole…

The Unit manages to bring the children of the main suspect to Spain to put pressure on him. The search for the possible mole stalls

After confirming that there is a mole, some arrests are made. But new obstacles appear in the Unit's investigation.

An attack puts Carla's team to the test, as they have to face unforeseen consequences and which they must face without support from the authorities.