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A few days later, the children discover new riddles and clues left by their elderly neighbour in a hiding place under the floor of the treehouse. Mr Summerling invites Marley, Cy and Isla to his house, full of secret rooms, secret staircases and ghosts. But there is a time limit for completing this quest. Will the children solve the neighbour's new, much more complicated and frightening riddle, since they will always be under the watchful eye of their enemy?