Goddess Revealed, book three.

When Cayden picks up the girdle he finds in the basement of the Royal Ontario Museum, his head is filled with images of a beautiful woman. She becomes all he can think about, and he's convinced he's losing his mind—until she appears in his apartment, pushes him to the floor and has wild, hot sex with him.

Shesmetet is an Egyptian goddess who lives in the immortal realm, but as soon as she sees Cayden, she knows that he's her mate, the one who will make her complete. But for them to be together, Shesmetet will have to learn to live in the mortal realm...and Cayden will have to give up his life as he knows it.