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You Have to Stop This is the fifth and final book in the Secret series by Pseudonymous Bosch. In this installment, a class trip to a natural history museum goes awry when the protagonists, Cass, Max-Ernest, and Yo-Yoji, are forced to work for the curator after Cass accidentally damages a priceless mummy. When tragedy strikes, the trio must journey to ancient and mysterious lands to clear their names and uncover the next secret.
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