Brother and sister Jerry and Daisy Lou Malone leave behind their provincial Midwestern upbringing to test their mettle in the big, beckoning world of 1920s America. For Jerry, the future lies west, with like-minded pioneer souls keen to play the 'land game' as homesteaders on the Great Plains. Daisy, in turn, heads for the lights and luxe life of New York City, hoping to sing her way to stardom.
But fate and failing fortunes reunite them in tiny Shelby, Montana - and draw them into the 1923 Dempsey-Gibbons World Heavyweight Championship, the faltering town's grand scheme to save itself from economic ruin. And for a moment as fleeting and spectacular as Halley's Comet, these American dreamers will savor the sweet taste of an extraordinary life.