Shadow forest - Matt Haig

Samuel Blink is the hero of this story, but he doesn't know it yet. Right now, he and his sister Martha are in the back of his parents car. He has no idea a giant log is about to fall from the sky and change his life forever. He doesn't know that he and Martha will be forced to move to Norway and eat their Aunt Eda's smelly brown cheese. He hasn't the slightest clue Martha will disappear into Shadow Forest. A forest full of one-eyed trolls, the sinister huldre-folk, deadly Truth Pixies and a witch who steals shadows. A forest ruled by the evil Changemaker. A forest so dangerous that people who enter never return.

No. Samuel Blink doesn't know any of this. So don't tell him. It might ruin the book . . .