Henry knows that there’s magic in the wood—magic that can turn evil when the moon is blue. Once in a blue moon everything can happen and now the moon is blue. Deep in the wood behind Henry garden, trolls, invisible crocodiles, witches and strange creatures —the garingay and the yo yitsoo — are celebrating Grandpa Yo Yitsoo’s birthday on a pirate ship. Henry’s dad doesn’t believe in magic—he knows twenty-six reasons why trolls don’t exist— but now he’s been turned into something with the head of pelican and the tail of a fox and put in a cage. There he will remain, unless Henry, his sister Lucy, the smallest troll in the world and a monkey faced creature called Fiendish can defeat Grandpa and Grandma Yo Yitsoo and the wicked garingay…