The Hunt for the Seventh — Christine Morton-Shaw

With every step he takes around the carefully manicured grounds of Minerva Hall, Jim is haunted by the ghosts of children, long dead, whom no one else can see. Urging him to "find the Seventh," the children leave him cryptic clues pointing to a devastating ancient prophecy that only he can stop from being fulfilled.

If Jim doesn't figure out the clues, innocent people will die. But how can Jim find the answers while the dangers of the Hall grow ever more threatening? And even if he can, the real question is -- is Jim already too late?