Download or read book Young Cam Jansen and the Knock, Knock Mystery written by David A. Adler and published by Penguin. This book was released on 2015-06-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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! Garden State Children’s Book Award 2017 Nominee.