A king in a mythic kingdom has built an arena for dealing with criminals. It has two doors. Behind one is a lady and behind the other a man-eating tiger. If the criminal chooses the lady, he marries her, and if he chooses the tiger he gets eaten.
The king’s daughter and a commoner are in love, but their relationship is illegal. The man is sentenced to the arena. Behind one door is a tiger. Behind the other is a woman the princess thinks may be trying to have a relationship with her lover. The man looks at the princess, who knows which door contains which, and she indicates which door he should choose. The reader doesn’t find out what is behind the door.