The Hitman’s Secret Love Child by Terry Towers

He never expected his next mark would be his high school sweetheart.

I accepted the contract even though I knew the subject of the hit. Years had passed, and I no longer cared about anything — except for the money that would find its way into my bank account. The crosshairs settled on her body — a body I once knew intimately — and I felt nothing. I took up the slack on the trigger. Memories counted as nothing, as less than nothing. Three steps to the mark, two steps, one step…. And then the world turned upside down.

A face at the lower left edge of the scope, one that bore a striking resemblance to the one I had seen in the mirror as a child, caused me to freeze. And I knew my life would never be the same again.
I have to know why she didn’t tell me — even if it means that the next hit is on me.