The Sniper’s Wife by Archer Mayor

Opening lines:

… He wasn’t looking for flaws in his shaving. And, God knows, there was no narcissism taking place. Willy was the first to acknowledge his was a purely functional appearance. He had what was necessary: a nose, two eyes, a mouth, none of it particularly remarkable. As far as it went, it was just a face.

And yet he studied it every morning the same way, carefully warily, especially watching the eyes for any deepening of the intensity which even he found disturbing.Had he seen them on somebody else, they were eyes that would have given him pause — eyes which troubled him all the more that they were his. They were what made of the whole truly something to remember, and although he didn’t know it, they were the one feature almost everyone remembered about his face.