Young Cam Jansen and the Knock Knock MysteryBook - 2015
Eric's Grandma Minnie and Grandpa Max keep hearing someone knock at their door, night and day, but find no one there, so Cam tries to solve the mystery using her amazing memory.
Publisher: New York, New York : Penguin Young Readers, an imprint of Penguin Group (USA) LLC, 2015
Branch Call Number: Red Reader ADLER 2014
Characteristics: 31 pages : color illustrations ; 23 cm