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.

Sam and his sidekick Glory time travel back and forth through time, pursuing a villain intent on destroying the world and saving their mentor Peter from being murdered as an infant.

Alex always thought his life was boring at best. But when he learns that his favorite time-traveling heroes Sam and Glory are his real parents, Alex realizes he never needed to dream of an elsewhere. Just an elsewhen. But when Alex sets out to find Father Tiempo, he is ambushed and transformed into the powerful villain El Terremento. Now there's not a second to waste. Unless Sam and Glory Miracle can stop the son they didn't even know they were going...