A mythical key is about to be found . . . but what kind of door will it open? A mysterious, isolated house awaits sixteen-year-old Fern and her brother Will for the summer holidays. As the old house reveals its secrets, their familiar world starts to fracture, giving access to a magical and corrupt land destroyed thousands of years ago. For hidden in the house is a talisman which has been sought by the forces of good and evil for millennia. And only someone possessed of the Gift can use it.
Soon, Fern finds herself being courted by the enigmatic wanderer, Ragginbone, and the sinister art-dealer, Javier Holt, who know that she has the Gift. Both want her to find the talisman, and use it to unblock the door, but what awaits her on the other side . . .?