After hearing about their grandfather's boyhood encounter with the Chupacabras, a green, winged creature with glowing eyes, Juan and his cousin Luz decide to find out if the story could be true.

Vincent Ventura, monster fighter extraordinaire, can't believe the house at 666 Duende Street has attracted yet another creepy creature! In fact, there are several unusual beings, including ghosts and a lady in white with fiery glowing eyes! Is she ... La Llorona?!? And who is the other young woman? The next day at school, Vincent and his cousins meet a new substitute teacher, Ms. Malin Che, who just moved into the haunted house. What is her connection...