Heart of Vengeance by Lisa Edmonds

When dealing with vampires, expect betrayal at every turn…

Mage private investigator Alice Worth’s life has changed dramatically. On the plus side, she has a new home to share with alpha werewolf Sean Maclin and her ghost sidekick Malcolm. She’s also gained an office with her name on the door, a fearsome ally, and dark magic inherited from a defeated enemy.
On the downside, a dire prophecy hangs over her head, she’s uncovered a terrible betrayal, and the new magic is killing her.
When the ancient head of the Vampire Court calls in a favor, Alice is forced to put aside her own problems to hunt a stolen treasure. She and Malcolm travel to realms full of wonders and nightmares in their pursuit of a thief consumed by need for vengeance. To survive and return home, they must rely on a motley group of highly unusual allies.

In pursuit of justice, Alice and Malcolm face many terrifying adversaries. Unfortunately, some are much closer to home than they could imagine…