Although Baron Arvid von Frühling travels to the fashionable spa town with his fiancée Stephanie, he soon neglects her because of the Baden-Baden Grand Prix, which he is determined to win with his racehorse Eintagsfliege. The writer Victor Duplessis, known in the town as Casanova, seizes his chance and approaches Stephanie. When Arvid finds out about this, he challenges Victor to a duel, which turns out to be a strange affair: In the end, the two become friends. Arvid, who then dumps Stephanie, gets Victor to give him tips on how to seduce her, and soon they are both involved with the beautiful Margot. When the charming Charlotte arrives at the race, the love chaos is perfect.