Niilo, a son of a rich estate owner, is in love with a poor crofter's adopted daughter Heleena. However, on his father's orders, Niilo instead becomes engaged to Loviisa, a daughter of a wealthy landowner. When Niilo wants to call off the engagement, his proud and rejected bride begins to interfere with the lovers' relationship with the help of Penttula, who is said to be able to perform miracles.
