Sebas is a rookie police officer looking to change his life who is transferred from his natal Valladolid (Castile and Leon, center-north to Spain) to the coastal Cádiz, Andalusia (south to the country) helped to an aunt-in-law who works as councilwoman. Reluctant Comisario Jaime is forced to accept Sebas, giving a job in the police seizures, checking any kind of material implied in a crime with Gallego as job partner. Former prodigy child of piano and student of conservatory, Sebas is required by a rude and pregnant police detective, Pepa, to infiltrate him in a music band named The Lolos after to know that a local mobster, Abeledo, hired the band for the incoming wedding of his daughter Fani, in the hope to discover the identity of his partner-in-crime The Ghost, a drug lord who rules the city since a few years ago. Assisted by Pepa and her partners Blas and Mula, Sebas is submitted to a radical change for pretending to be a true Andalusian boy from the back streets. Despite to be lost as alien on Earth, Sebas meets the band formed by Lolo, Ortiguilla, Piojito and Fotosho, getting a place in the band as keyboardist (replacing El Pieza, arrested on purpose previously by Pepa). Turning in part of the band, Sebas meets Lolo's sister and band manager Luci, a streetwise girl that since the first moment catch his attention. While Sebas discovers the world of the music trap and little by little feels loyalty and friendship to the band, Pepa, Blas and Mula follow Abeledo in the searching to find The Ghost. However, things complicate in the worst way: a Lolo's friend is discovered by Sebas as Abeledo's worker transporting drug from the boats that arrive to the coast, and Antoñito, a blue collar criminal a drug dealer for Abeledo, discover Sebas' true identity and blackmails him for his own business. Will can Sebas not only save the day but the band before Abeledo discover the truth and order kill everybody?