Margaret, daughter of the king of Scotland, longs for adventure. Tired of setting a good example for all the other young girls -- and of waiting to be married -- Margaret flings down her embroidery one day and runs out of the castle, over the fields to Carterhays, a wood that is supposedly haunted by Tam Lin, an Elfin knight. There, indeed, she meets Tam Lin, who is remarkably handsome. When she learns his story -- that he is human, not Elfin at all, and was stolen as a baby by the Elfin Queen -- she determines to help break the enchantment that holds him. Courageous and steadfast throughout one fearful night, Margaret defeats each dangerous and dramatic attempt by the Elfin Queen to keep Tam Lin. And when the morning sun rises, Margaret and Tam Lin ride together across the green fields of Scotland, back to the castle.