The Archimedes Gambit (David Brin's Out of Time Series)

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.\nOnly the young can survive time travel. And the future needs . . . you?\nYanked ahead four centuries, Bronx highschooler Meagan Cohen finds herself teamed with three other teens from various eras—Karter, a cat-eyed gangboy from decades in her future, Dae-Jung from 1930s Korea, and Parrette, a companion of Joan of Arc. Together with some 24th-century youths, they were supposed to negotiate a treaty between humanity and the alien Tarn. Until something goes terribly wrong. Deadly sabotage reveals a danger more fearsome than any alien; the advance artificial intelligence Archimedes has gone rogue, killing in its bid for freedom and dominance!\nIn a desperate race against time, the team of time-yanks must hurry across the solar system to confront Archimedes, before its plan may unravel time itself.\nPrevious books in David Brin’s Out of Times series include Yanked by Nancy Kress, Tiger in the Sky by Sheila Finch, and The Game of Worlds by Roger MacBride Allen