Cece Rios thought saving her sister would be the end of her adventures in the world of criaturas. But part of Juana's soul is still trapped in Devil's Alley. As Cece tries to find a way to get it back using her new curandera abilities, Juana takes her fate in her own hands and sets off alone, intent on restoring her soul and getting revenge on El Sombrerón. But then they discover that El Cucuy, king of the criaturas, is hunting for Cece, craving...

Cece Rios and her friends have escaped Devil's Alley, but the fight to save their world is just beginning. Despite her growing comfort with her curandera abilities, Cece is worried that she won't be strong enough to stop her most dangerous enemy yet: her tía, Catrina. Desperate for power and revenge, Catrina has seized the throne of Devil's Alley and set her sights on the living world. Catrina's first move is a brutal attack on the Sun Sanctuary...