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.

Ángela Vidal the young television reporter who entered the building with the fireman, manages to make it out alive. But what the soldiers don?t know is that she carries the seed of the strange infection. She is to be taken to a provisional quarantine facility, a high-security installation where she will have to stay in isolation for several days. An old oil tanker, miles off shore and surrounded by water on all sides, has been especially equipped for the quarantine.