Trace

I enjoyed Trace by Patricia Cornwell which is set in Virginia, USA.  Kay Scarpetta is asked to return to her former workplace as a consultant to investigate a mysterious death.  A young girl, Gilly, has been murdered and Scarpetta works out how it happened.  There appears to be a mix-up with the trace evidence from another case.  The story becomes complicated by another attempted murder in Scarpetta's niece Lucy's house.  The different strands come together in the end. 31/2/5