Under Witch Moon by Maria E. Schneider
Series: Moon Shadow Series, Book 1.
Approx. 92,310 words.
Published on September 29, 2010.
Under Witch Moon is the first in an urban fantasy series: When dead bodies start turning up Adriel has no choice but to talk to White Feather, an undercover cop. Unfortunately, Adriel is a witch and White Feather isn't convinced she's innocent of wrongdoing. She's going to have to talk fast--and set spells even faster if she expects to survive.