Morag's family have an island -- Wild Island -- remote and uninhabited. They holiday there each year and Ellie is excited to be going too. But when Morag falls ill and Ellie finds herself alone on the island, day after day, she begins to sense another presence. Ellie notices small changes to her paintings... and when she's lost a fire lights her way home -- is it just her fevered imagination? Or is there someone in the lighthouse? Is Ellie not alone on the island?