After having clawed her way back to life, Maddie is haunted by visions, and driven by her unfinished business. Meanwhile, her bestie, Simon, is stuck in the purgatorial state that exists in Split River High. He becomes obsessed with uncovering the school’s secrets: chiefly, why have so many perished at the campus? And what has Mr. Martin, the ghosts’ longtime mentor, been hiding? The closer Maddie, Simon, and their pals get to the truth, the more questions they unearth – and the more peril they put themselves in …