Stranger in the Mirror — Laraine Anne Barker

Still I heard those footsteps. I couldn't be imagining it. The sound was far more real than the echoes in the house. I took another look. And my heart did a double leap. For a black figure was running furiously down the side of the house. It burst into the sunshine--the very essence of what I had imagined crouching behind the kitchen door--my nightmare become reality. As if it isn't enough to wake up in unfamiliar surroundings, being cared for by a man named Raoul who must be her husband but seems even more alien than the face staring at her from the mirror, the narrator of this fast-paced romantic suspense discovers there is something--and someone--in her past too terrifying to remember.