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.
Item Details
ISBN:
9780670012619
9780142422250
Description: 31 pages : colour illustrations ; 23 cm.
Control Number: 2577310
Publisher: New York : Penguin Young Readers, 2014.
