On the morning of August 5, 1984, four of the greatest marathoners of all time lined up for one of the most important and long-awaited races in history. By then, they had dominated their competition for at least five years, upending a century's worth of preconceived notions of what marathoners could do. By decade's end, they had lowered the world record a total of 13 minutes, won 27 major marathon titles, and swept every Olympic and World Championship...