Look Again by Lisa Scottoline.
This is a really good book. And you know this because otherwise I wouldn't be telling you about it. Because between you and me? I only tell you about the ones I have really, really enjoyed (and no, I haven't been paid or otherwise compensated to do so - just so you know).
The premise is this: you've adopted this child; this wonderful, beautiful child. He is yours. Your whole world revolves around this child.
Then one night as you are returning home from work you pick up the mail. You happen to notice one of those "Have You Seen This Child" flyers. You know, the ones we all glance at and then toss. And the face looking back at you looks very much like the little guy sleeping in the next room.
You reject the notion outright. Because you followed the rules. You did everything right - there is no way that they could be the same.
The resemblence is so eerie.
And being an investigative reporter?
You can't let it go. So you begin to dig - just a little. Because you just can't help it.
And then people involved start to die. So, of course, you dig a little deeper.
And . . .
That's all you get from me. If you have any interest go find this book.
Personally, I will be looking for other books by this author because I enjoyed this one so much. It's not a long read but it will keep you hooked almost from the start.