"Death of an Expert Witness" by P.D. James

This book pretty well had me riveted, even though I had read the last page, and so knew who the murderer was. It's amazing how old fashioned a crime book from the 1970's can seem. No cell phones, and a distrust of scientific evidence by juries. Definitely pre CSI 'know-it-all' juries. Takes place in a forensics lab.