Penguin Holiday Guide

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Young Cam Jansen and the Knock, Knock Mystery

David Adler; Illustrated by Susanna Natti


Cam, her best friend Eric, and Eric’s mom are spending the day with Eric’s grandparents. But Grandpa and Grandma seem too tired to visit. Every so often, a knock at the door wakes them up. But when they go to answer, no one is there. Is a Knock, Knock Ghost on the loose? It’s up to Cam to solve the mystery!