The century-old Toronto Argonauts, like the rest of the Canadian Football League, seemed to be in shambles in 1991. Then everything changed. The Argos were acquired by an unlikely trio: the greatest hockey player of all time, Wayne Gretzky; a universally beloved comic genius, John Candy; and an upstart sports magnate, Bruce McNall, whose apparent Midas touch masked dark secrets. They audaciously swiped from the NFL the most-hyped college athlete in...