A semi-barbaric king rules the kingdom and decided the fate of the accused with a game of chance. One door leads to a women to be the accused wife and the other to a ferocious tiger.
The king discovers that his daughter has been seeing a commoner and condemns him to his game. The princess knows the woman her lover will be marrying if he opens her door and knows which door leads to the tiger.
The princess raises her hand to the door he should open in a way only her lover notices. As she knows where the tiger and the lady both are.
The lover trusts the princess and opens the door she chose
It is never told what the door he opened lead to.
The theme of the story is that choices have consequences. Shown by the accused choosing a door to open and the result being either good or bad.