After discovering a terrible secret hidden in the most boring book in the world, Iowa fifteen-year-olds Luke and Tommy find out that members of a secret Nazi organization intend to use this information to rewrite history.

Fifth-grader Alex Trumble builds a "dingus"--a time machine--when his brother Stephen is kidnapped by dangerous, evil time-travelers, to get back to the past and into the future to save his family from disaster.

Abigail, Jacob, Zack, and Bo travel back in time to meet Dr. Martin Luther King Jr. in order to convince him not to get discouraged.

Kira has done all that she can to protect and shield her younger sister, Elspeth. Now it's time for Elspeth to grow up. When Paradon's muddled magic sends the two sisters traveling through time to different eras, new challenges and terrifying threats await each. Elspeth is in the past and Kira in the future. And Kuira must find a way to get back to Elspeth and reunite her family.

When a boy being chased through present-day London seeks refuge in the National Gallery, a dog escapes from the painting of one Dutch master and together they leap into the painting of another, where their adventures in seventeenth-century Delft are a prelude to returning to London and continuing the chase.

When twelve-year -old Josephine falls through a worm-hole in her garden shed into another time and place, she realizes the troubles she has at home are minor compared to what she has to tackle now in the world where she has landed.

Abigail and her friends have a really important job to do: they must convince George Washington to stay in Valley Forge and continue to fight the Revolutionary War. The future of America depends on him! Turns out, General Washington is pretty stubborn. No matter that the kids say, or where they take him, they can't get him to change his mind. Will Abigail and the boys succeed, or will the father of the United States of America become just a blip in...

"What if you suddenly found yourself in Addy Walker's world in the middle of the Civil War? Join Addy on adventures as you outrun a slave catcher, raise money for soldiers, and search for Addy's family. Your journey back in time can take whatever twists and turns you choose, as you select from a variety of options in this multiple-ending story"--

Eighteen-year-old Hannah experiences danger in the past and present, as college intern Jordan tries to uncover the truth about Hannah and her memories--

Jack and Annie travel back to Victorian London when Merlin asks them to use their magic to inspire Charles Dickens to write "A Christmas Carol."