When Claude's little sister, Amity, runs off in forbidden Badwell Woods - where children disappear - Deliah, Sam and Claude follow her to a mysterious mansion. Inside, time has frozen in the 1930s and an invitation promises a devious party game. Not long after they find a terrified Amity, hiding from 'ghosts', the floor beneath their feet starts to twist and turn: the rooms are changing places. The house has rearranged itself like a giant Rubik's cube. To escape, they must solve the puzzle - and the century-old mystery of a girl who disappeared ...