Taking a turn caring for the class pet hamster, Marion is devastated when the hamster goes missing and she receives an anonymous letter in her locker with clues leading to a mysterious scavenger hunt.

Callie Barkley loves animals. As a young girl, she dreamed of getting a cat or dog of her own until she discovered she was allergic to most of them. It was around this time that she realized the world was full of all kinds of critters that could use some love. She now lives with her husband and two kids in Connecticut. They share their home with exactly ten fish and a very active ant farm.