Shadow Guardian by Jennie Lynn Roberts

Not all shadows are what they seem…

Kay swore an oath to use her Shadows to guard the light—an oath she takes very seriously. So, when a dark Shadow arises to terrorize London, she steps up and fights back. The last thing she expects is to find herself being patched up by a sexy paramedic who has no idea what kind of power he could control… or for her Shadows to recognize him as their perfect match.
Ethan doesn’t trust easily—not in matters of love, and certainly not in… whatever supernatural secrets Kay’s mixed up in. But the more time they spend together, the more he realizes he needs her with an intensity he’s never known before. Accepting her crazy, Shadow-filled world will be difficult. Opening his heart to her… he’s afraid that might be a step too far.
But the dark Shadows are growing. Their enemy is powerful—and closer than anyone realizes. Can Kay and Ethan claim their happily ever after? Or will the darkness claim them first?