Just shy of her fifteenth birthday, Gabriela Amador Prieto has been cast out of the family home by her father for tarnishing the family honour. All traces of her are brutally erased, and not even Lucy, Gabi's older sister and best friend, knows where she is. Furious at her father and desperate to find her sister, Lucy leaves their small town in Baja California, Mexico, and sets out for the capital to track Gabriela down. Lucy ventures deep into Mexico City's most dangerous neighbourhoods, coming face to face with the dark underbelly of the city, while back at home her family members--her parents, her brothers, and her devious brother-in-law, Antonio--struggle with their own complicity in Gabi's fate.