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. & it wants the most dangerous thing of all from Conor. It wants the truth. Bestselling novelist Patrick Ness takes the final idea of the late award-winning writer Siobhan Dowd & weaves a heartbreaking tale of mischief healing & above all the courage it takes to survive.