The Surgeon by Tess Gerritsen
This is a great book with a brilliant, if gruesome, storyline. It's well written and is a real page turner.
The plot revolves around a serial killer in Boston who targets lone woman and the police who are trying to catch him. There are certain twists along the way and it becomes clear to the police that the killer is working towards an ultimate goal...
Towards the end of the book, my heart was in my mouth and I couldn't read quick enough to find out what happens. All in all, I thought this was one of the best books I'd read in ages, and will definitely be looking for more titles by Tess Gerritsen.