Passage at Delphi, Book One of The Apollo Series
by AK Patch
A terrorist attack in modern-day Greece causes Apollo, the god of prophecy, to foresee the collapse of Western civilization. He handpicks a husband-and-wife team, college professors Lauren and Zack Fletcher, to travel back in time into the front lines of the war between Greece and Persia. There they learn the hard lessons of history, so they can help him change the course of events in the future.