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Jazzgossen (The Jazz Boy) is the filmed biography of famed Swedish showbiz entrepreneur Teddy Anker. During the Roaring '20s, socialite Anker (played by Hasse Ekman, who also directed), diverts his family millions into managing a nightclub, promoting prizefights, inaugurating a movie company, and various and sundry other forms of entertainment-industry largesse. Losing his fortune in the financial crash of the early 1930s, Anker picks himself up, dusts himself off, and starts all over again. The story ends during WWII when, despite Sweden's neutrality, Anker vows to do his bit for the war effort. Several of Teddy Anker's contemporaries play themselves, including musican Karl Gerhard, who originally popularized the title song.