00995cam a2200277 i 4500 172527553 TxAuBib 20140101120000.0 130807s2014||||||||||||||||||||||||eng|u 2013027008 9780670012619 hardcover 0670012610 hardcover DLC eng DLC TxAuBib rda Adler, David A. Young Cam Jansen and the knock knock mystery / by David A. Adler. New York : Published by Penguin Group, 2014. pages cm. txt rdacontent n rdamedia nc rdacarrier 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. 20140101. Memory Fiction. Grandparents Fiction. Mystery and detective stories.