Her best friend has vanished. Her only ally is her friend's aloof brother. Can they solve a deadly mystery, before they become the next victims?

Fourteen-year-old Holly Champion is devastated when, following a traumatic incident, her father sends her away to an exclusive school in Cornwall. Acorn Academy, a magnificent clifftop mansion, looks stunning, but why are the students so docile and obedient? Why does the principal seem to dislike Holly so much? And what happened to the mysterious Lydia, who occupied Holly’s room before her?

When Holly’s new friend Jess vanishes without trace, Holly's only ally is Jess's brother Adam, who seems to dislike her. Together they must risk their lives in a terrifying struggle, racing against the clock to expose a shocking plot.