In 1936 Madrid, an idealistic doctor's life changes forever when he shelters a wounded spy and joins a decades-long fight against the spread of fascism.

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.

In 1991 Madrid, after holding a séance at school, a teen girl minding her younger siblings at home suspects an evil force has entered their apartment.

Years ago these cousins and best friends we inseparable, creating adventures that would last a lifetime.

Recounts the experiences of a middle-class family, the Alcántaras, during the last years of the rule of Francisco Franco and the beginning of the Spanish Transition to democracy.