Hollow Fortress: Part 1 of The Four Gates

Nicholas Herron an American soldier falsely accused of desertion accepts a job offer from a wealthy though enigmatic elderly woman and finds himself in another world helping to prevent a catastrophic war. Although uncertain whether this other world is a dream or another dimension entirely he begins to suspect his actions there will reflect back in the world from which he came. In the course of his adventures he finds love and confronts death including his own. Gradually he begins to discover the unimaginable truth of his own being.