Eight-year-old Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs.

Sibling ninjas Kai and Nya battle the evil Time Twins.

In 1889 London young women are turning up dead, and Evaline Stoker, relative of Bram, and Mina Holmes, niece of Sherlock, are summoned to investigate the clue of the not-so-ancient Egyptian scarabs--but where does a time traveler fit in?

¡El pollito de Clementina se fue a ver dinosaurios y aún no ha vuelto! ¿Se habrá perdido y estará con uno de ellos? Clementina sube a la máquina del tiempo y retrocede al pasado para buscarlo. Clementina's chick went to see dinosaurs and hasn't come back yet! Was he lost and was he with one of them? Clementina gets into the time machine and goes back in time to look for him.

"Jack and Annie use the magic tree house to travel back in time to 1947 Brooklyn, New York, where they pretend to be batboys at Jackie Robinson's first game with the Brooklyn Dodgers against the Boston Braves"--

Seventeen-year-old Prenna, an immigrant who moved to New York when she was twelve, came from another time and she and the other travelers must follow strict rules to avoid destroying the new life they have worked so hard to get, as well as the one person Prenna is desperate to protect.

Jack and Annie travel to a monastery in the Swiss Alps where, with the help of St. Bernard dogs and magic, they seek the second of four special objects necessary to break the spell on the wizard Merlin's beloved penguin, Penny.

When pirate cats threaten Mouse Island, Professor von Volt sends Geronimo Stilton and his friends back through time to ancient Greece, Atlantis, and Stonehenge to try and find out how ancient civilizations were able to find peace and avoid war--only to find that the key to peace was under their whiskers the whole time.

"When Jack and Annie receive an invitation to spend Christmas Eve in Camelot--a magical place that exists only in myth and fantasy--they know they are in for their biggest adventure yet. What they don't know is that the invitation will send them on a quest to save Camelot. Can they succeed even though Camelot's greatest knights have failed?"--Amazon.com.

As a thank-you from Merlin and Morgan, Jack and Annie are sent on what should be a vacation at a luxurious resort in Cozumel, Mexico, but is, by mistake, an adventure with ancient Mayans, instead.