Under Wildwood (The Wildwood Chronicles Series #2)

Ever since Prue McKeel returned home from the Impassable Wilderness after rescuing her brother from the malevolent Dowager Governess, life has been pretty dull. School holds no interest for her, and her new science teacher keeps getting on her case about her dismal test scores and daydreaming in class. Her mind is constantly returning to the verdant groves and sky-tall trees of Wildwood, where her friend Curtis still remains as a bandit-in-training.

But all is not well in that world…