I just finished Nicholas St. North and the Battle of the Nightmare King.
I enjoyed the book. The beginning reminded me of The Life and Adventures of Santa Claus by L. Frank Baum; with the moonbeams and nature creatures being characters. I was worried it was going to be too "Fantasy" for me (I don't care for epic fantasy type books). But it was more on the lines of a fable/fantasy/ prequel. Kind of like Dave Barry & Ridley Pearson's Peter and the Starcatchers, which is a prequel for Peter Pan, this is a very different interpretation of origins of St. Nicholas.
The Book is actually a quick read that tells of Nicholas St. North a great thief, who helps protect a village against the evil Pitch aka, the Nightmare King and ends with Nicholas' adventures being continued. This is the first in a book series by William Joyce called the Guardians of Childhood. The next book is called E. Aster Bunnymund and the Battle of the Warrior Eggs.