After a freak car accident, seventeen-year-old Zoey Mulligan is shocked to discover she can hear people's thoughts. She hates it at first, but then realizes she can use it to her advantage—like outsmarting her opponents on the soccer field and learning her crush likes her back.
But when she finds out her stepmother never liked her, her true friends weren't true at all, and her father sees her as a burden, Zoey moves back in with her mother in the small town of Driftwood. When she arrives, she hears a dark thought planning to kill people in town soon, but can't figure out who it's coming from.

Through their thoughts, Zoey discovers that everyone in town has a secret—from her mother, aunt, and soon-to-be-uncle to her new friends—with some of them being blackmailed by a mysterious figure known as the Watcher. Zoey must sift through their secrets and find out who's planning murder—and stop them before they wreak havoc on her small town.