There Hangs the Knife — Marcia Muller

Joanna Stark, art lover and part owner of an art security firm, has devised a daring plan to recover two valuable stolen paintings. Here scheme will also entrap one of the world's greatest art thieves - a man with whom she shares a passionate and violent past. But when she finds an unidentified corpse in her friend's London flat, Joanna realizes her best-laid plans have gone murderously awry. Plunging deep into Britain's fabulous art world and terrifying underworld, Joanna must confront her nightmare past as she races to recover the paintings, and stay alive in the bargain.