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When twins Felix and Maisie Robbins's parents divorce, they move with their mother to Elms Medona, a historic seventy-room mansion in Rhode Island. After six months of living in the servants' quarters, Felix, Maisie, and their mother move into the mansion at the insistence of Great-Uncle Thorne and Great-Aunt Maisie.
The twins continue their adventures in The Treasure Chest - a secret room containing a collection of strange and wonderful artifacts and, most importantly, the key to time travel.
Now Felix and Maisie find themselves on Coney Island with a young magician named Harry Houdini. The twins run away to the circus with Houdini only to discover a familiar face: a teenage Thorne! More mysteries of the Pickworth family and Elm Medona are revealed in this fast-paced fourth adventure.