Richard Palmer Grant Dorcy Jr. (Powell), a.k.a. "the Canary" and "the singing bird of the tropics," is an enlisted man in the United States Army. Stationed in the Hawaiian Islands, he has a contentious but friendly relationship with his sergeant, Scrapper Thornhill (Pat O'Brien). When General Fitts (Henry O'Neill) visits the post with his daughter Kit (Keeler) on their way to Manila, Dick is assigned to drive her to a reception that evening. Falling victim to the moonlit night, Kit and Dick attend a luau instead, and he sings Aloha ‘Oe. They are discovered in each other's arms by Scrapper and Lieutenant Biddle (John Eldredge), who is also in love with Kit. Biddle accuses Dick of ruining Kit's reputation and forcing her to accompany him off post. Dick decides to desert. Scrapper begs Kit to straighten things out with Biddle.