Fifteen-year-old Ari Mendoza is an angry loner with a brother in prison, but when he meets Dante and they become friends, Ari starts to ask questions about himself, his parents, and his family that he has never asked before.

Lupe Impala, Elirio Malaria, and El Chavo Octopus are now the proud owners of their own garage--but when a series of earthquakes hit their town and Genie, their beloved cat, disappears they find themselves traveling to the realm of Mictlantecuhtli, Aztec god of the Underworld, who is keeping Genie prisoner.