In Madrid, Spain, a mysterious serial killer ruthlessly murders his victims by recreating the first appearance of several comic book superheroes. Cosme, a veteran police inspector who is about to retire, works on the case along with the tormented inspector David Valentín and his own son Jorge Elías, a nerdy young man who owns a comic book store.

When Ana and Edu are having trouble getting pregnant, her friend Dani volunteers as a surrogate mother for the couple. Meanwhile, Raúl is trying to get Víctor to write his next novel, but he's focused on other things.