Status Updates From Dust (Kay Scarpetta, #21)

I am about 3/4 through and really struggling. I got frustrated and put it down for a long time. This is my fourth Scarpetta book (scarily out of order), but I am really having trouble getting into this one. Not sure whether I will finish it. Something is rubbing me the wrong way. Lucy, for one? It is not flowing for me like the other books did.