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The finale to the New York Times bestselling Secret Series! I always feared this day would come. A secret is meant to stay secret, after all. And now weve come to this the fifth and final I swear! book in my saga of secrets.A class trip to the local natural history museum turns dangerous, or perhaps deadly--and I dont mean in the bored-to-death way--when Cass accidentally breaks a finger off a priceless mummy. Forced to atone for this crime of vandalism, Cass and her friends Max-Ernest and Yo-Yoji go to work for the mummy exhibits curator, only to be blamed when tragedy strikes. To clear their names--and, they hope, to discover the Secret--the trio must travel deep into a land of majestic pyramids, dusty tombs, mysterious hieroglyphs, and the walking dead.