Two people are dead. One ravaged by poison. One tied to a fence and left to bake in the Arizona sun.

And the evidence points to one unusual suspect - fourteen-year-old Jessica Ann Cooper.

The nation celebrated Jessie Cooper as the Young Artist of the Year, mesmerized by her disturbingly captivating paintings. Accolades hailed her as a savant and artistic genius. But maybe a more chilling title would be cold-blooded killer.

And now, like a shadowy vapor, Jessie Cooper has disappeared.

Private Investigators Jake Steiner and Mallory Dimante are about to find out how disturbed the teenager is when, out of their past, Jessie Cooper and her brother Michael come crashing back into their lives. And teenager Jessie Cooper carries with her a twisted, personal secret so deeply buried that when revealed will threaten not just Jake and Mallory’s lives but that of their infant daughter too.

In this riveting mystery thriller, everyone will be confronted with a haunting question - just how crazy… and dangerous is Jessie Cooper?

The Over Under, the final installment of award-winning author C. J. Booth’s Diamond and Stone mystery series completes the story cycle that began with The Park Trilogy and brings the lives of all to a final, astonishing conclusion.