Coolsville is shaken up when eco-goth band The Hex Girls move to town. Teenagers Thorn, Luna, and Dusk are looking for a fresh start for themselves and their band after the disastrous events that destroyed their hometown and Thorn's reputation. But things take a turn for the worse when a mysterious mist starts killing crops and making people sick wherever Thorn goes. She quickly becomes the town's prime suspect and is outcast once again.

As her band falls apart, Thorn turns to the Mystery Inc. gang, especially Velma, for help as they try to solve the mystery and prove Thorn's innocence. While the gang thinks that Thorn's magical powers are the key to stopping the growing threat to Coolsville, Thorn is sure magic will only bring more harm than good--and that revealing her true nature would make her an outsider forever. Can they solve the mystery and save Coolsville before someone gets seriously hurt. . . or worse?

Full of classic Scooby-Doo antics mixed with darker, more mysterious horrors, this spooky, romantic mystery is sure to thrill teens and Scooby-Doo fans!