Circle of the Moon (Soulwood, #4)

Nell can draw magic from the land around her, and lately, she's been using it to help the Psy-Law Enforcement Division, which solves paranormal crimes. Joining the team at PsyLED has allowed her to learn more about her powers and the world she always shunned--and to find true friends.

Head agent Rick LaFleur shifts into a panther when the moon calls him, but this time, something has gone wrong. Rick calls Nell from a riverbank--he's naked, with no memory of how he came to be there, and there's a dead black cat, sacrificed in a witch circle and killed by black magic, lying next to him.

Then more animals turn up dead, and the team rushes to investigate. A blood-witch is out to kill. But when it seems as if their leader is involved in the crime, the bonds that hold the team together could shatter at any moment.