Maddy Rose lives in two worlds. A hundred years apart. In the same strange house built as an octagon. When a mysterious black cat leads her into its unknown attic, she meets Clare and his very sick sister Eva. Together Maddy and Clare jump into a money-making scheme in his uncle's dangerous soap factory to buy a cure for Eva. But an unexpected tragedy befalls them. And then Maddy is pulled back into her own time to confront the premature birth of...

"Leo, Carla, Dani, Elena, and Lucas thought they would spend the afternoon punished in a lab full of fossils. But the craziest adventure of their lives awaited them: a trip to a place where dinosaurs are still alive! Now they must figure out how to get back to their world, and also rescue someone lost in that mysterious land. Not to worry, some magical teeth have given them amazing powers!"--Penguin Random House web site.

After Nate's middle school basketball team suffers a frustrating loss, he and his cousin Rachel travel back in time to see the 1992 Dream Team in Barcelona, and learn about teamwork--but he still needs to convince the other players on his team to share the ball.

"Tamiko the dinosaur fanatic and Ollie the rainforest expert travel back in time to the Ice Age to lead a group of woolly mammoths away from a dangerous avalanche"--

"Saralee is stunned to learn that she's not the only one in the family with a superpower. Her great-grandmother Gigi also had a magical sense of smell. And when Saralee makes Gigi's Hanukkah donut recipe, the scent creates a portal in time. Soon Saralee finds herself face-to-face with a young Gigi--and she's not the fierce, unstoppable person Saralee imagined. Gigi's ready to give up on her dreams. Saralee needs to help her find courage, or the future...

"The sixth book in the bestselling British madcap time-travelling series, served with a dash of wit that seems to be everyone's cup of tea. Behind the seemingly innocuous facade of St. Mary's Institute of Historical Research, a different kind of academic work is taking place. Just don't call it "time travel"--These historians "investigate major historical events in contemporary time." And they aren't your harmless eccentrics either; a more accurate...

The continuing adventures of Colonel Jack Collins and the rest of Department 5656--better known as the Event Group--as they fend off an attack at their very heart while they must deal once again with history beginning to repeat itself.

When a time-traveling T. rex named Oskar lands in Tim's backyard, best friends Tim and Tito embark on the adventure of a lifetime along with their new prehistoric pal as they save humanity from impending doom.

"Based on the beloved Doctor Who episode of the same name by Douglas Adams, the hilarious and brilliant author of The Hitchhiker's Guide to the Galaxy, comes City of Death... "A nasty, savage race, the universe was glad to see the back of them..." 4 billion BCE: The Jagaroth, the most powerful, vicious, and visually unappealing race in the universe disappears from existence. Few are sad to see them go. 1505 CE: Leonardo da Vinci is rudely interrupted...

After Amy is struck by lightning, she and her silent friend, Moo, are able to communicate telepathically, travel through time, and face a child-eating witch.