Moonlight is the first book in the young adult Dark Guardian series by Rachel Hawthorne.
Summary from Barnes and Noble:
Kayla is the nature lover, the all-American beauty who can't understand why she's so drawn to distant, brooding Lucas. Adopted as a young child, she has no way of knowing that she's inherited a terrifying—and thrilling—gene that will change her life forever.
Lucas is dangerous, gorgeous . . . and a werewolf. As leader of the Dark Guardians, shape-shifters who gather deep within the state park, he has sworn to protect his pack. But when Lucas finds his true soul mate, his love could put them all in harm's way.
As Lucas and Kayla struggle with their feelings for each other, a greater danger lurks: Humans have discovered the Dark Guardians and are planning their destruction. Kayla must choose between the life she knows and the love she feels certain is her destiny.
I wasn't sure how much I would like this book, but actually enjoyed it quite a bit. The setting is different than many young adult books, even paranormal ones. This book takes place almost entirely in the woods. It was a very quick read, and I thought the characters were interesting. Some if it was a little dramatic, but it seemed to work. You know before reading it that Lucas was a werewolf, so you were just waiting to find out how it would be revealed. Looking forward to the other books in this series, it seems like the next one focuses more on some of the other supporting characters.
The only thing that bugged me a little about the story was that even though Kayla clearly liked Lucas, she kept going off with Mason, who was quite obviously a jerk.