"Where did the tree house come from? Before Jack and Annie can find out, the mysterious tree house whisks them 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?" --

Time has gone wrong, and best friends Dak Smyth and Sera Froste, together with the young Hystorian Riq, must use the infinity ring to travel back to one of the Great Breaks--a mutiny on the Santa Maraia--to correct history and defeat the SQ.

While backpacking solo in the desert, thirteen-year-old Mark falls into a tube of blue light and is transported into a more primitive world, where he must use his knowledge and skills to survive.

Pulled through a glass that brings him back in time, Septimus Heap becomes the apprentice of an alchemist.

In their magic treehouse, Jack and Annie are again transported to King Arthur's realm, where invisible beings, giant ravens, and mistaken magic spells have a duke's castle in an uproar on Halloween night.

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

The Time Traders Andre Norton - The first novel in the classic series, in which wars are no longer fought on land, in the air, or on the sea-but throughout time and space itself . . . The never-ending tension between Russia and the United States has been escalated by a stunning new variable: time travel. While the Americans can roughly utilize the technology, the Russians have learned the secret of space travel-and that makes the US vulnerable. What...

"World War II is raging across Europe and the Axis and Allied powers are in a stalemate. Dak, Sera, and Riq can tip the scales in the Allies' favor if they can pull off the most daring spy mission of all time. But even if they succeed, are they playing into the SQ's hands?" --Back cover.

"Jack and Annie travel back in time to 1925 Nome, Alaska, where they meet Balto, the famous sled dog, and help save the town from illness"--

It's a treasure trove of trouble! Jack and Annie are in for a high-seas adventure when the magic tree house whisks them back to the days of deserted islands, secret maps--and ruthless pirates! Will they discover a buried treasure? Or will they be forced to walk the plank? The magic treehouse whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.