After falling for Kate, her unexpected death sends Jack back in time to the moment they first met. He soon learns that his actions have consequences when someone else close to him dies.

Before Jack and Annie can find out, the mysterious tree house whisks them back to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark...or will they become a dinosaur's dinner?

When eight-year-old Jack and his seven-year-old sister, Annie, join a group of nineteenth-century explorers aboard the H.M.S. Challenger, they learn about the ocean, solve the mystery of its fabled sea monster, and gain compassion for their fellow creatures.

The magic tree house takes Jack and Annie to San Francisco in 1906, in time for them to experience one of the biggest earthquakes the United States had ever known.

"Mason and Ty were once the very best of friends, like two nerdy sides of the same coin...until seventh grade, when Ava Petrakis came along. Now Mason can trace everything bad in his life to that terrible fight they had over the new girl. The one thing he'd give anything for is a do-over. But that can't happen in real life--can it? As a science kid, Mason knows do-overs are impossible, so he can't believe it when he wakes up from a freak accident...

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.

"Life used to be great for Rose: full of friends, a loving mom, and a growing fashion blog. But when her mother dies in a car crash, Rose is sent away to live with a strange grandmother she hardly knows and forced to attend a new school where mean girls ridicule her at every turn. The one place Rose finds refuge is in her grandmother's Tudor-style greenhouse. But one night, she sees a strange light glowing from within it. She climbs a ladder to investigate......

On Christmas Eve, Jack and Annie's tree house transports them to King Arthur's castle at Camelot, where they undertake a quest to the castle of the Otherworld.

"Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash" --Title verso page.

The fifteen-year-old Murry twins, Sandy and Dennys, are accidentally sent back to a strange Biblical time period, in which mythical beasts roam the desert and a man named Noah is building a boat in preparation for a great flood. When twins Sandy and Dennys Murry accidentally interrupt one of their father's experiments, they are hurtled out of their ordinary world, across time and space into a mysterious desert land populated by unicorns, seraphim,...