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.

Emma, who writes stories for children, wakes up in her thirties without a partner or stable work. In the midst of the chaos in which her life has become, her best friend Lola announces that she has become pregnant and asks her to be the godmother of her first baby