When she was twelve, Kit Learmonth watched her parents drown in a storm as their boat sailed over the Tranter Sink Hole. Now seventeen, Kit doesn't remember the incident, and she doesn't want to. In fact, her only clear memories from before her parents' death are of the fantastical stories of pirates and mermaids that she and her dad invented about the small island where she grew up, a place she calls Neverland.
Following Kit's parents' death, her uncle and guardian, Doc, transformed the island into a boarding school for mentally ill teenagers and sent Kit away to school on the mainland. But when Kit tries and fails to end her life, Doc brings her home to the island and places her in the care of his colleague, Dr Hannah Ward.
Resisting her treatment, Kit instead pulls her friends deeper into her world of make-believe. It's only when Kit and her new boyfriend, Rohan, take the fantasy too far and land themselves in very real danger that her faith in Neverland is shaken, and Kit must find a way back to reality.