One of the books I've read in the past week is Phantom Shadows by Dianne Duvall. This is the third book in her Immortal Guardians series. I highly recommend going back to read the first two--Darkness Dawns and Night Reigns--not because you have too, but because you'll want to. If you enjoy paranormal romance you have to give this author a try.
Dr. Melanie Lipton is no stranger to the supernatural. She knows immortals
better than they know themselves, right down to their stubborn little genes. So
although a handsome rogue immortal seems suspicious to her colleagues, Sebastien
Newcombe intrigues Melanie. His history is checkered, his scars are impressive,
and his ideas are daring. But it's not his ideas that have Melanie fighting off
surges of desire.
Bastien is used to being the bad guy. In fact, he can't remember the last
time he had an ally he could trust. But Melanie is different--and under her
calm, professional exterior he senses a passion beyond anything in his centuries
of experience. Giving in to temptation is out of the question--he can't put her
in danger. But she isn't asking him...