Half-siren Elvira Vance doesn’t trust outsiders. Especially not the human detective who’s been hired to investigate the disappearances of a chupacabra and the crown for the Marfa Monster Festival. While humans are convinced the monster skipped town with the crown, Elvira knows there’s more to the story. As the daughter of Vince Vance—founder of Vince Vance’s Vintage Trailer Park Inn for Monsters—Elvira cares too much about her home to let this mystery go unsolved.

With her two best friends, Elvira collects clues and investigates humans, banshees, vampires, and ghosts. But when more creatures start disappearing and antimonster attitudes rise, Elvira realizes that her friends could be in real danger.

Now time is running out, and Elvira must use her siren powers and sleuthing skills to solve this mystery—or lose everything she loves.