Champagne Charlie

This is the tale of Charles Heidsieck who introduced Champagne to the American market right before the Civil War. Though a hesitant French spy, he ends up caught and held in a Union prison. The story also features two love stories (since, well, he's French) and some conflicts with his uncle over who gets to run the family vineyard. The tension comes from the fact that his dad married his mom, who was also his uncle's love interest.