Unleashing Darkness by Melanie James

With the evil forces of Gobekli Tepe defeated, Kate Salenko finds her career in a sudden downward spiral. All alone and with her reputation in tatters, she surrenders to a life of seclusion. An old friend reaches out to present her with an intriguing offer; to sign on with a cable TV show and hunt down the origin of a mysterious artifact. Sweetening the deal, she learns she will be accompanied by the sexy and mysterious Nick Wilder.
Her exciting new job propels her on a wild journey that puts her on a collision course with the man who broke her heart, and potentially back into the grasp of an ancient supernatural evil. With two men vying for her love, Kate can’t help but wonder if battling an ancient demon would be the easier task to face.