Dark Mirror by Barry Maitland

At the London Library, a woman named Marion Summers collapses and dies from arsenic poisoning. Marion was working on her PhD at London University, concentrating her studies on Dante Gabriel Rossetti and the Pre-Raphaelite Brotherhood. She also led a very private life, without her friends and family knowing much about her personal life--including where she was living. Newly promoted, DI Kathy Kolla delves into Marion's movements and research to find out who wanted her dead. With an ex-con stepfather, a possibly jealous supervisor and a secret lover, suspects abound. I throughly enjoyed this latest book in the sometimes hit-or-miss Brock and Kolla series. Since Maitland focuses more on the details of the investigation than the lives of the detectives, it helps to be interested in the topic. In this case I am, and I think it's one of his best.