While building an irrigation system for a Southwestern desert community, an engineer vies with a local cowboy for the affections of a rancher's daughter.
A tale of the World War I love affair, begun in Italy, between American ambulance driver Lt. Frederic Henry and British nurse Catherine Barkley. Eventually separated by Frederic's transfer, tremendous challenges and difficult decisions face each as the war rages on.
As a parting shot, fired reporter Ann Mitchell prints a fake letter from unemployed "John Doe," who threatens suicide in protest of social ills. The paper is forced to rehire Ann and hires John Willoughby to impersonate "Doe." Ann and her bosses cynically milk the story for all it's worth, until the made-up "John Doe" philosophy starts a whole political movement.
Two young men, one rich, one middle class, both in love with the same woman, become US Air Corps fighter pilots and, eventually, heroic flying aces during World War I. Devoted best friends, their mutual love of the girl eventually threatens their bond. Meanwhile, a hometown girl who's the lovestruck lifelong next door neighbor of one of them pines away.