Alice Gould, a private investigator, pretends to be mentally ill in order to enter a psychiatric hospital and gather evidence for the case she is working on: the death of a patient in unclear circumstances.

Lucía, a club dancer on the run, takes refuge in a sinister building on the outskirts of Madrid where her sister Rocío lives with her daughter Alba.

Unaware of the zombie mayhem unleashed outside their tent, Pablo has a massive hangover and Ruth keeps a secret.