After his parents are kidnapped, Henry is sent to live with his uncle's family in a big old farmhouse in Kansas. In his attic room, Henry begins to hear things in the wall, and discovers 99 hidden doors that have been covered with plaster for years. As he and his cousin Henrietta begin to explore them, and figure out how to enter them, Henry realizes that these doors, or cupboards, lead to different worlds - and not all of these worlds are good places to visit - and some things that come out of the cupboards can lead to great harm!


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