One Good Knight by Mercedes Lackey

When a dragon storms the castle, what should a (virgin) princess do? Why, turn to her studies, of course But nothing practical-minded Princess Andromeda of Acadia finds gives a definitive solution. The only Traditional answer, though, is soothing the marauding dragon by a virgin sacrifice. Things are going fairly smoothly with the lottery--except for the women chosen, of course--until Princess Andromeda herself is picked

But facing down the dragon doesn't go quite as planned, and now, with the help of her Champion, Sir George, Andromeda searches for the dragon's lair. But even--"especially"--in the Five Hundred Kingdoms, bucking Tradition isn't easy. It takes the strongest of wills, knowledge, quick wits and a refusal to give up, no matter what happens along the way.

Basically, this book is about a Princess named Andromeda or Andie for short, is sacrificed to a dragon thanks to the evil plan of her mother, Queen Cassiopeia of Acadia and her right hand man, Solon (who reminded me SO MUCH of Sir William Cecil, all except he's a magician). Cassiopeia asked Solon to erect a barrier to keep out Godmothers and Champions to face the dragon. 

But did they count on a female Champion? Did they also count on Andie and one of the dragons, Peri, to fall in love? Nope they did not. Did they also expect that the dragons don't eat the virgins that they sacrificed? *glares at Andie* Nope. 

The most shocking thing to me was the fact that Solon killed Cassiopeia and then turn into some huge Demon that scared the living crap out of Andie, and the other fact was that Andie's mother-HER OWN MOTHER-basically turned her into a ghost in the castle when Andie started doing reports and started treating her like a young lady even though Andromeda was a Princess, and wanted to get her out of the way. 

I did enjoy this book a whole lot and I really do reconmend it.