Deception on His Mind by Elizabeth George

Balford-le-Nez is a dying seatown on the coast of Essex. But when a member of the town's small but growing Asian community, a Pakistani named Haytham Querashi, is found dead near its beach, his neck broken, sleepy Balford-le-Nez ignites. And working solo, without her long-time partner Detective Inspector Thomas Lynley, Sergeant Barbara Havers must probe not only the mind of a murderer and a case very close to her own heart, but the terrible price people pay for deceiving others...and themselves.