No. 16 was Death in a Cold Dark Light by Francine Mathews:
I thought this was a good mystery about three murders in Nantucket. The main character is a competent women police detective who doesn't get herself into trouble while solving the crime.
I most often read in bed at night, and I had a little trouble following this one at first. Perhaps my brain was just too sleepy.
Also, one of the villainous characters is named Hannah. I've read a whole series where the hero is named Hannah, so my mind had a little trouble with that one :)