A dead girl found in a lake. A living girl haunted by ghosts. A sleepy town upended by the mystery—who killed Perdita?

Arielle Delaney has a wild imagination. Over her sixteen years, she’s often thought that ghosts could be real … and her older sister Casey has zero patience for it. But after Casey’s friend Perdita drowns in a nearby lake, echoing memories of a tragic drowning in the Delaney family, Arielle is haunted by disturbing visions and apparitions. Could it be Perdita, delivering a message from beyond the grave to help solve the mystery of her death?

Perdita’s drowning sends shockwaves through their sleepy town. Details that emerge only make the case appear more and more suspicious. Arielle reconnects with Tex, Perdita’s younger brother—a magnetic boy with dark secrets. And Arielle’s got secrets of her own. As the nightmarish visions escalate, so does Arielle’s fear that she may be losing her mind.

When Arielle meets a suspicious neighbor, opens a strange box with unexplainable contents, and discovers a disturbing note scrawled in red, she’s more confused than ever, and the question remains: What happened to Perdita at the lake that night? And who is haunting Arielle?

In Arielle’s pursuit of the truth, the line between what is real and what is imagined and who is friend and who is foe becomes obscured—leading to a shocking conclusion.