The King of Elfland's Daughter by Lord Dunsany

The King of Elfland's Daughter - Lord Dunsany, Neil Gaiman

This is a faery tale that focuses on the story that happens after the marriage of the elf-princess with the mortal prince.  Getting what you asked for isn't always a good thing.  The writing is lyrical and ethereal.  The story entertaining and enchanting, if occassionaly a bit slow.