Mysterious Ms. Lemon

When the Besties try to track their new and incredibly mean sub-teacher Ms. Lemon, to their lemon-shaped hut, they discover that she is no ordinary human being. They also find out that she not only hates children but she also hates trees. She is determined to destroy the ideal and environmentally friendly village of Rosemallow. As the Besties have a series of unbelievable adventures, will they be able to stop Ms. Lemon's malevolent plan?