In 1889 Evaline Stoker, Mina Holmes, and their time traveler friend, Dylan are asked by the Princess of Wales to find out what happened to Robby Ashton, who may have drowned--but the reappearance of vampires in the heart of London threatens to become a more urgent problem.

From the Jurassic period and the dinosaurs, to a medieval castle, Geronimo Stilton and a few members of his family embark on an adventure through time in Professor von Volt's new time machine, the Mouse Mover 3000.

Children's birthdays are always strange in Willow Falls, but when Connor's little sister Grace falls into a frozen state on her tenth birthday, Amanda and Leo must travel back in time to find out what force prevented Angelina from casting the blessing that would have protected her.

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle. Morgan le Fay will make Jack and Annie masters of the tree house if only they can solve four riddles -- which will take four books, of course! Dolphins at Daybreak begins the third set of four books in this magical (and increasingly popular) series! Jack and Annie are off in the Magic...

Callie struggles to come to terms with the disappearance of her father, but eventually chooses to believe that he has traveled back to the San Fransisco earthquake of 1906.

The Bad Guys find themselves sixty-five million years in the past where they must avoid being eaten by dinosaurs, fix their broken time machine, and get back home before an evil alien destroys the world.

When Uncle Al is kidnapped by Dr. Kron-Tox and sent to prehistoric times, Andrew, his cousin Judy, and Thudd the robot try to use Uncle Al's latest invention, the Time-A-Tron, to rescue him, and learn first-hand about the origins of the universe.

Jack and Annie travel to Vienna, Austria, in 1762 where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.

With his ability to travel through time using vintage baseball cards, Joe takes Flip with him to find out whether Satchel Paige really was the fastest pitcher ever.

Using a mysterious wardrobe that allows them to travel through time, two eleven-year-olds, Federico a boy from the Italian Renaissance and Bee a girl from present-day New Jersey, work together to prevent the bickering between two great artists from changing the future.