The Academy - Drop of Doubt

Drop of Doubt is the fifth book in The Academy Ghost Bird Series. 

Sang Sorenson and the Academy boys return to Ashley Waters High School but before they get a chance to even settle in, Sang's life is threatened by an anonymous caller.

They retreat to the protective walls of the Morgan estate, a safe house for when the boys are under fire. But when new threats can break through those barriers that once kept them secure, it leaves Kota, Victor, Silas, Nathan, Gabriel, Luke and North rushing to figure out who is hunting them.

But when you're fighting a ghost who seems to know all your secrets, retreating is no longer an option.

The Academy, Deceptively Strategic