Conor has the same dream every night, ever since his mother first fell ill, ever since she started the treatments that don`t quite seem to be working. But tonight is different. Tonight, when he wakes, there`s a visitor at his window. It`s ancient, elemental, a force of nature. And it wants the most dangerous thing of all from Conor. It wants the truth. Patrick Ness takes the final idea of the late, award-winning writer Siobhan Dowd and weaves an extraordinary and heartbreaking tale of mischief, healing and above all, the courage it takes to survive.