George and Harold are behind bars for a crime they didn't commit! But just as they are settling into their new life, they are pulled from prison by a time-traveling tyrant named Tippy Tinkletrousers! Now the boys are taking a trip back in time to the carefree days of kindergarten, when the scariest thing they had to face was not evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school...

From debut author and poet Lexa Hillyer comes the lyrical story of four seventeen-year-old friends who receive an unlikely chance to relive the perfect summer . . . and the devastating secret that could unravel it all. Elegant and evocative, Proof of Forever is one of those first novels that hooks you from the beginning and builds toward a stunning-and unexpected-end, calling to mind Gayle Forman and Ann Brashares. Joy, Tali, Luce, and Zoe were once...

Jason and his magic cat Gareth travel through time to visit countries all over the world during different periods of history.

Thirteen-year-old Remi, who has just moved to California from Haiti, and his neighbor Niya travel back in time to solve the mystery of the night train.

After Stone Rabbit is transported back to prehistoric times, his bottle of barbecue sauce becomes the key ingredient in a power-hungry Neanderthal's plan to dominate the world.

To prevent the destruction of his planet, teenaged Rigg Sessamekesh, who can manipulate time, must assume more responsibility when he and others travel back 11,000 years to the arrival of human starships.

Jack and his younger sister take a trip in their tree house back to ancient Egypt, where they help a queen's mummy continue her voyage to the Next Life.

Dr. Clock and his baby travel back in time to visit prehistoric animals in the Ice Age.