Duel in the Sun
 The early part of the book describes the preparations that Beardsley and Salazar underwent before the marathon, along with many other aspects of the men's running backgrounds and personal lives. There are three concurrent story lines: Beardsley's life, Salazar's life, and the marathon itself. It is revealed early on that Salazar, who was already a renowned distance runner in the late 1970s and early '80's, was the favorite to win Boston. Beardsley, described as a small-town farmboy, is clearly the underdog. But as the race progresses and the stories of the two men's lives are developed in greater detail, it becomes clear that both men will have a chance at winning the Boston Marathon, generally considered to be the most prestigious in the world. The story gradually becomes an intense contest between Beardsley and Salazar as they leave the rest of the runners behind during the latter part of the marathon. The title comes from the two men's shadows cast by the hot sun onto the pavement as they run "in each other's pockets" during the final miles of the race, and anticipation builds as to who will win the "duel." The shadow is also featured prominently on the cover of the first edition as part of the title. After the race, the lives of both runners spiral downhill. The book describes in detail Salazar's depression and compromised immune system, and Beardsley's industrial accident and drug addiction.