
Teens ripped from the past must stop an AI's killing spree in a rip-roaring time travel adventure from the multiple Bram Stoker Award-nominated author. Only the young can survive time travel. And the future needs . . . you? Yanked ahead four centuries,...

In the far future, humanity's greatest creation just declared war on its makers-and the only ones who can stop it are children pulled from the past. When a time-warping experiment called Operation Hourglass brings four teenagers from...