It's a series of three books, and they are awsome! I read aloud at night for an hour before bed, and we have all enjoy this series. There is sword fighting and knights, falling in love, and staying true to the "one true King". We saw lots of Christian (and some Catholic) parallels in the story, because we were looking for them. Great discussions, btw! But I would also think a non-Christian could read the series for fun and be just as excited about them.
I encourage families here to read them and discuss them. And if you don't have a family, read it anyway, darn it! It's a good book!