The princess and the pea

As a young prince nears adulthood, the Queen tells him he must find a princess bride -- but not just any princess will do. Only a true princess will satisfy his mother. The young prince searches the entire kingdom, but returns home alone and sad. Late one stormy night, a mysterious woman knocks at the castle door. She claims to be a true princess, but the Queen has her doubts. So, she concocts a clever scheme to see if the princess is the real thing.