After moving with her parents to Iowa, twelve-year-old Lucy discovers a mysterious notebook that can bring stories to life and which has a link to the 1914 disappearance of her great uncle.

Eleven-year-old orphan Tommy Learner's world in 1900 New York City collides with that of twelve-year-old, modern-day Jezebel Lemon in the basement of her apartment building, where together they must use the portals between worlds to thwart the Dead Gentleman, a legendary villain whose last unconquered world is the planet Earth.

With their house in foreclosure, sisters India and Mouse and brother Finn are sent to stay with an uncle in Colorado until their mother can join them, but when the plane lands, the children are welcomed by cheering crowds to a strange place where each of them has a perfect house and a clock that is ticking down the time.

Ten-year-old Kara follows mysterious tracks in the snow that lead her across time and space from modern-day Sweden to 1942 Germany where two siblings are hiding from the Nazis.

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.

A seven-day book of magic proves to be fractious for five children, who must learn the book's rules and tame its magic.

As a seventeen-year-old sophomore at NYU, Casey wears different disguises to fit in, but when she starts hearing voices and seeing visions, she travels to a remote beach town and searches for answers.

It has been two years since Joseph Harker first Walked between dimensions, met the alternate forms of himself, and formed a team to protect the Altiverse in the struggle between the vicious forces of magic and science--and now, injured, he has returned to his own dimension, bringing danger with him.

"A boy goes on a long car ride to visit his grandmother and discovers time moves faster or slower depending on how bored he is"--

We are warriors! Jack and Annie have met knights, pirates, ninjas, and Vikings, but they have never met the most fearsome warriors of all: Roman soldiers. When the magic tree house whisks them back to the early 100s AD, Jack and Annie find themselves in a Roman camp. Their mission: Be like a warrior. That is easier said than done! The Roman soldiers are much scarier in person--and suspicious of strangers. Then a mysterious man riding a black horse...