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

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.

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.

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...

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.

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.

The Betarrinis and the boys they love are back with these two novellas that follow Waterfall, Cascade and Torrent. In Bourne, the story picks up right where Torrent left off...Find out what has happened to wounded warriors returning from battle, to the Betarrinis, fighting for the men who've captured their hearts, and what will happen to them next... A year later, in Tributary, Lia struggles to overcome the fear that constant battle has heaped upon...

Jack and Annie travel back to nineteenth-century Ireland to inspire a young Augusta Gregory to share her love of Irish legends and folktales with the world.

As thousands of Viking warriors attack Paris, Sera, Riq, and all the people of the city struggle to defend themselves and Dak remains a prisoner, forced to work for the invading army.

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.