Winnie and the Mystery of Missing Moonstones in Bloomington, MN

Dad's decision to go camping late in the season leaves Winnie and Jerry with nothing to do but bicker and annoy each other. But when Winnie storms off in anger, she accidentally rescues a real live troll! All their moonstones were stolen, and they need Winnie's help to get their magic back!
Winnie and Jerry start off on a whirling adventure with their new friends, Oola and Humphry, and encounter new dangers with each step of their journey. Even if they find the treasure, how will they get home?