The Trouble with Wizards and Old Enemies - Cary Redmond, #6

Trouble with a Vengeance. In her seventh year as a magical Protector, Cary Redmond has faced down more world-ending, life-or-death situations than she cares to remember. And now that she's discovered she's not as ordinary as she thought, finding ways to not die is getting even tougher. Especially with all the enemies she's collected while saving good guys from bad guys. So when her latest job forces her to confront too many of these old enemies, Cary desperately wants to refuse.
Unfortunately, walking away is not an option, thanks to more of that world-ending trouble so common in her life. With the help of her leopard shifter mate, Cary once again faces overwhelming odds in a quest to save the world. And hopefully not die.