The life of the young Sergio and Iris revolves around a dangerous cult. Just like in the song "Planeta 5000", he dreams of entering, and she dreams of escaping.
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.