Bloodlust by Midnight

Being a badass witch isn't always what it's cracked up to be. Vampire Hunter Phoebe Kilsen's world is falling apart. Her shifter partner has been drugged and is in danger of turning rabid, and her brother has disappeared into thin air… literally. 

Just as Phoebe is on the verge of making a major breakthrough on finding her long-lost brother, a new drug is introduced into New Orleans's black market. It's Phoebe's job to find out who is responsible and neutralize them before New Orleans is overrun with rabid wolves. With Eadric Allcot as her number one suspect, she finds herself once again facing down the most powerful vampire in New Orleans. But when her partner Dax is viscously attacked with the drug, she needs Allcot's help to save him. Now she's forced to make a choice between defying orders and saving the one she loves. The decision is an easy one for Phoebe. She's willing to break all the rules to save Dax… and if luck is on her side, she might even find her brother.