A Traitor to Memory by Elizabeth George

When Eugenie Davies is killed by a driver on a quiet London street, her death is clearly no accident. Someone struck her with a car and then deliberately ran over her body before driving off, leaving nothing behind but questions.

Now the pressure is on Lynley to find Eugenie Davies' killer. For not only is he putting his own career into jeopardy, but he is also attempting to safeguard the careers of his longtime partners Barbara Havers and Winston Nkata. Together, they must untangle the dark secrets and darker passions of a family whose history conceals the truth behind a horrific crime.