Repeat visits from an owl convince Paula in the gnome's reincarnation, Iván can't believe he killed a man, Fermin fights for his life while losing the paintings, the gang discovers a second door, and Saúl preps a new operative.。自古以来,人类与人鱼之间便战争不断。人鱼以人类为食,人类则觊觎人鱼一族身上的宝物。人类雄踞大陆,人鱼拥有大海。但人鱼因无法离开大海,所以总是无法取得最终的胜利,直到有一天……。