A farmer's daughter is faced with a dilemma when an ugly old man who is owed a debt proposes to annul it if she marries him. He puts two black pebbles in a bag and tells her if she picks one, she must marry him. However, if she picks the white pebble or refuses, her father will go to jail. Noticing he used two black pebbles, she cleverly drops the one she picks so its color can't be identified, but reveals his cheating by having him show the other pebble, which is also black. This allows her to avoid marrying him and saves her father from imprisonment.