The weather is finally warming up in Sleepyside and Trixie has plans for her and her best friend Honey. They’re going to lonely Martin’s Marsh to collect herbs and flowers for botany class. But Honey’s family has a visitor, a child who wants to tag along on Trixie’s and Honey’s expeditions. How can Trixie explore the mysterious burned-out house by the marsh and look for Captain Kidd’s hidden pirate treasure with a kid along?