Calendar Mysteries #9: September Sneakers

In the ninth book of the Calendar Mysteries series, Bradley, Brian, Nate, and Lucy face a new challenge when Goldi, the class hamster, goes missing on their first day back at school. The friends notice strange green-and-orange sneakers appearing around town as they investigate the mystery behind Goldi's disappearance and other missing items. Will they be able to find their way to the sneaker thief and reunite with Goldi?