Lupe Davila travels to Puerto Rico to stay for the summer with her uncle, the local police chief, and his wife. When her uncle investigates a murder, Lupe finds clues that no one wants to follow up on. It seems two of four of Javier Utierre's best friends have died under mysterious circumstances. Lupe and Javier team up and vow to find out who is behind the deaths to save Javier from being the next victim, but the evidence leads them into the world of myths and legends where monsters lurk.