Time Out — Chris Lowry

When boy genius Jim Cabot accidentally builds a time machine, he propels himself back to medieval France to fight alongside Joan of Arc against the English invaders. Convinced it's a dream, Jim goes all out to help the Maid of Orleans in her fight to restore the Dauphin as King of France. But his strange language and attitude sets him apart and when the French leaders suspect a spy in their midst, all eyes turn on Jim. Can he use his brains and the power of the Maid to escape before it's too late?