One of the greatest pitchers of his era, William Arthur "Candy" Cummings was born in 1848, when baseball was in its infancy. In the 1870s, Candy's invention, the curveball, played a transformative role and earned him a place in the Hall of Fame. Drawing on extensive research, this first full-length biography traces Candy's New England heritage and chronicles his rise to the top, from pitching for amateur teams in mid-1860s Brooklyn to playing in the National Association of Professional Base Ball Players—the first major league—and then the newly-formed National League. A critical examination of the evidence and competing claims reveals that Cummings was, indeed, the originator of the curveball.