Nocturne City, book 3 : Second Skin
Caitlin Kittredge2009

When werewolves from Nocturne City's oldest packs start showing up shot through the head execution-style, police officer Luna Wilder must find out what's killing them and why…before she becomes the next victim.

Luna traces the killings to a band of shapeshifters made of smoke and shadow who drink the blood of their victims for strength. Believed to exist only in legend, their race is all too real—and now their leader, Lucas Kennuka, is out to wrest Luna's heart from her beloved Dmitri. To make matters worse, Dmitri is suffering from a mysterious illness brought on by a demon bite, and his condition grows more grave with each passing day. Now Luna must rely on Lucas to defeat an invisible enemy—a serial were-killer bringing death and destruction to all who stand in its path…