A windswept private island off the coast of Massachusetts. A hungry ocean, churning with secrets and sorrow. A fiery, addicted heiress. An irresistible, unpredictable boy. A summer of unforgivable betrayal and terrible mistakes. Welcome back to the Sinclair family. They were always liars.

Alex Green is four years old when she first sees a dragon. In her next-door neighbour's garden, in the spot where the old lady usually sits, is a huge dragon, an astonished expression on its face before it opens its wings and soars away across the rooftops. And Alex doesn't see the little old lady after that. No one mentions her. It's as if she's never existed. Then Alex's mother disappears, and reappears a week later, one quiet Tuesday, with no explanation whatsoever as to where she has been. But she is a ghostly shadow of her former self, and with scars across her body, wide, deep burns, as though she had been attacked by a monster who breathed fire.