When horses, teens and psychic powers come together in a small but prominent Florida equestrian village, it's not surprising that events explode in a fiery cascade of twists and turns that propel 16-year-old Merlina Lund into an investigation of corruption in the horse industry. A suspicious barn fire claims the life of Merlina's aging pony, and triggers Merlina's latent psychic talents, which she has inherited as the seventh generation in a lineage of powerful witches. She then sets out to track the arsonist, even though authorities are calling it an accidental fire. Merlina's mother, who has denied her own psychic talents, urges her to drop the investigation-let the police handle it-while Trella, her feisty Cuban grandmother urges her on. Meanwhile, Merlina's best friend, Haylee Ackerman, worries when Merlina starts to fall for Billy Hopkins, who just might be responsible for the fire.The deeper she digs, the more dangerous the quest turns as she closes in on the truth about the Cosa Caballo, a mysterious horse mafia centered in her pristine home town.