A gruesome crime has occurred in La Pedrera - Casa Milà: a burnt body has appeared on the façade of Gaudí's emblematic building. Inspector Milo Malart (Isak Férriz), until now suspended for indiscipline in the Mossos, returns to work in Barcelona to, with the help of sub-inspector Rebeca Garrido (Verónica Echegui), try to find the perpetrator of the crime.