The fourth chapter book in this quirky, beloved series focuses on teamwork in the classroom and care for the environment. Perfect for fans of Amelia's Notebook, Judy Moody, and Dory Fantasmagory series. There's a very special 150-year-old oak tree outside the window of Bea's classroom at Emily Dickinson Elementary School. When Bert, Bea's nemesis, climbs the tree, he gets in a lot of trouble--and that leads to even more trouble for everyone...