No one knows yet apart from Darren Shan himself and a few others (e.g. the editor, publisher etc.) Try reading it when it comes out. However, I found this on Wikipedia, taken from the blurb. "The girl gazes up at me. She's even younger than I thought, clutching a small teddy bear in one hand. 'Are you the bogey man?' she whispers, eyes round. 'Yes,' I croak, then take hold of her head with my huge, scarred, blood-soaked hands and crush..."