After his parents are kidnapped, timid twelve-year-old Henry York leaves his sheltered Boston life and moves to small-town Kansas, where he and his cousin Henrietta discover and explore hidden doors in his attic room that seem to open onto other worlds.

When Hyacinth Smith moves with her family to a new house, she discovers new friends and powerful enemies, and that her power with trees opens ways between worlds.

The lonely protagonist returns to her fantastical world for friendship and adventure, where only the most powerful motivations persuade her to return home.

In this book without words, a boy opens a door and invites the reader to explore the magical world on the other side.

When twelve-year old J.P. discovers a magical treehouse that sends her three days forward in time, she uses the portal to skip all the worst parts of middle school, despite the consequences.