In medieval Ireland Willy Brennon is a daring adventurer and highwayman in love with young Molly Bawn. Molly lives with her father in a house belonging to the mayor, whose son Jack is infatuated with Molly as well. Willy and Jack at first hold animosity towards each other but soon become allies. The mayor hates Willy and is determined to capture him but through the machinations of Molly and Jack, Willy makes a break for liberty. In time the young lovers are reunited and sail to America.