Abe Lincoln and the Selfie That Saved the Union — David Potter

Percy Jackson fans will embrace this humorous time-travel adventure that sends Mel and his friends right into the Civil War's Battle of Gettysburg.

Mel, Bev, and Brandon -- the Left Behinds -- are at it again. When the iTime app on their phones sends them to Washington, D.C., in 1863, they find themselves smack dab in the middle of the Civil War. They sit in on a séance with First Lady Mary Todd Lincoln and are shown every inch of the White House by Tad, the youngest Lincoln. But when they meet President Abe Lincoln himself, he is preoccupied with the fateful battle at Gettysburg, which is just under way.

The kids receive their marching orders -- they must somehow travel to Gettysburg, make sure what's supposed to happen does happen, save the Union, and be home in time for dinner. No biggie. After all, it's only the entire future of the country at stake.

Includes an author's note and information on Civil War reenactments and living history sites around the nation.