A high-spirited, short-tempered, young woman hates her father and loves to rebel against him. She marries a man whom her father hates but her marriage fails and she learns the errors of her ways.

In 1815, Michael Martin, member of an Irish revolutionary society, turns highwayman to support it, and soon becomes an outlaw. In Dublin, he meets famous rebel "Captain Thunderbolt" and becomes his second-in-command, under the name "Lightfoot."

The Farmer Germund is planning a wedding between his daughter Marit and Mats, the son of a neighboring farm. Everything seems to be going according to plan until Marit meets the fiddler Jon, an illegitimate son who enchants the youth with his violin.