"A group of children and a "spirit" go back through time to discover the beginnings of Halloween." --

Publisher Annotation: Regan Fitz and Elliot Mason are training to become Glitchers, or time travelers who prevent others from altering important historical events. They've always been enemies-but everything changes when they find a letter from the future that warns of a devastating event to come. Suddenly forced to work together, Regan and Elliot must get over their animosity fast, because to save everyone they know, they'll need to break every rule...

Jack and Annie travel 500 years back in time to Florence, Italy, and spend a day helping Leonardo da Vinci in the hope of learning another secret of happiness.

Esmeralda, who is both a princess and a powerful witch, must travel back in time to end a family curse or risk losing her true love, Prince Eadric, forever.

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.

Trapped in a world where magic is powerful and dreams are real, Cole and his friends are pushed to the limit as they make one final attempt to restore magic to the Outskirts and find their way back home.

Twelve-year-old Jenni's much-anticipated vacation with her family and best friend Autumn goes awry when an old elevator transports her to a future in which everything has changed, and she must not only return to her time but find a way to prevent what she has seen from coming true.

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.

Dora and Diego travel back to the dinosaur age where they help a lost dinosaur get back to her family.

Their magic tree house takes Jack and Annie back to a monastery in medieval Ireland, where they try to retrieve a lost book while being menaced by Viking raiders.