Cam, her best friend Eric, and Erics mom are spending the day with Erics 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? Its up to Cam to solve the mystery Garden State Childrens Book Award 2017 Nominee.
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