I'm one of those people who hates the scenes in movies when someone is doing something sneaky, knowing they could get caught at any second. I literally start breaking out from the anxiety. So, the fact that a lot of this story involved people sneaking around and following others, etc, had my heart firmly in my throat throughout. And because of that, I found myself unable to put this one down as I needed to find out what happened next. It was such a fun, twisty read, and although I did figure out who the killer was, it didn't take away anything from the story. 
This was such a great read. This was my first from this author, but it certainly won't be my last.