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Keys to the Demon Prison is the final book in the Fablehaven series, where Kendra, Seth, and the Knights of the Dawn race to stop the Sphinx from opening the demon prison Zzyzx by collecting the five artifacts needed to open it. The siblings must travel to exotic preserves around the world, battling dark forces and forming new alliances along the way. The story culminates in a final confrontation where the fate of the world is at stake.
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