The Kindness of Strangers by Katrina Kittle
Absolutely amazing. I had no idea what the novel was about when I picked it up - I had it on my shelf, and heard so many good things about it, so I picked it up - and once I started reading it, I was so drawn in, I couldn't put it down! The story is completely engrossing, even to the point where I've found myself thinking about it days after I've finished it.
Highly recommend this one!