When a monstrous chupacabra asks you for a favor, it's hard to say no!

A child-snatching phantom called La Llorona, known to generations of terrified Hispanic kids, has been haunting the area where chupacabra Pepe and his family live. She's responsible for a sudden rash of missing people, including Pepe's trusted friends. Pepe begs Jorge and his chupacabra friend Carter for their help, but solving the mystery would mean secretly traveling from New Mexico to Jorge's hometown of Los Angeles, along with their loyal buddies Liza and Ernie. It's a dangerous plan and Jorge would get into huge trouble if he was discovered. But also . . . his mom is there and he would give anything to see her again.

The young detectives embark on their riskiest adventure yet, unearthing clues that point to an elaborate scheme of vengeance. But is La Llorona real? And will her next victim be Jorge himself?