Calendar Mysteries #9: September Sneakers

In the ninth book of the Calendar Mysteries, an early chapter-book mystery series featuring the younger siblings of the A to Z Mysteries detectives, Bradley, Brian, Nate, and Lucy have taken care of the first-grade class hamster, Goldi, for the summer. But on the first day of school, when they plan to bring her back, Goldi is missing! In place of her cage is a green-and-orange sneaker key chain. Soon, the kids spot green-and-orange sneakers all over Green Lawn. And they find out other things hav