The Codex of Shadows - The Fire Mage Chronicles, #1

I'm an assassin, not a treasure hunter.  In the shadow-drenched alleys of New Orleans, I'm pushed past my usual assassin gig to retrieve a lost grimoire for the city's Master Vampire. Did I mention the grimoire holds the power to unleash Hades from the Underworld? With the fate of the world teetering on the brink, I'm forced to partner with Kestrel, a vampire whose allure is as potent as his secrets.  As Hades inches closer to freedom, I have no choice but to expose my powers.
Except there's a catch- Using them might destroy me. The Codex of Shadows is the first book in the Fire Mage Chronicles trilogy, an Urban Fantasy adventure with a morally gray hero, fated mates and vampires!