Shards and Ashes by Melissa Marr

Melissa Marr is an American author of young-adult/urban fantasy novels.
Kelley Armstrong has been telling stories since before she could write. Her earliest written efforts were disastrous. If asked for a story about girls and dolls, hers would invariably feature undead girls and evil dolls, much to her teachers' dismay. All efforts to make her produce "normal" stories failed.
Today, she continues to spin tales of ghosts and demons and werewolves, while safely locked away in her basement writing dungeon. She's the author of the NYT-bestselling "Women of the Otherworld" paranormal suspense series and "Darkest Powers" young adult urban fantasy trilogy, as well as the Nadia Stafford crime series. Armstrong lives in southwestern Ontario with her husband, kids and far too many pets.