Based upon Idelfoso Falcones novel. In the 14th century, Barcelona is experiencing one of its most prosperous moments. The city has grown to La Ribera, a fishing district in which the largest Marian temple ever known is built: Santa María del Mar. But the construction runs parallel to Arnau Estanyol, a serf of the land who, fleeing the abuses of The feudal lords of the countryside take refuge in Barcelona.

The capture in Spain of the most wanted terrorist leader in the world turns to country into the main target for terrorism. A countdown has started without the population knowing and the members of the Special Unit against jihadist terrorism, led by commissioner Carla Torres (Nathalie Poza), face the secret mission of stopping it in a race against time, while they try to resolve the conflicts of the personal lives that their job has, in part, stolen from them. Written by Movistar+