Regrets Only Book

I thought it started out fairly well and I was getting really interested, but all of a sudden -- about halfway through -- she lost me. It seemed to wander off in directions I was not following. Then toward the end -- almost the VERY end - it picked up again. I was pretty sick of the dead woman and her various children and affairs. There were two teenage men who committed suicide and that seemed like an unlikely coincidence. The detective was involved with a family member of the murdered woman and again -- unlikely. Just didn't like this much.