The Resistance Man (Bruno, Chief of Police #6) by Martin Walker

Bruno, chief of police in the French town of St Denis, is already busy with a case when the body of an undercover policeman who called Bruno for help only hours before is discovered, mutiliated, in the woods. Bruno's boss, the Brigadier, doesn't see the investigation as a priority, but Bruno has other ideas.

Meanwhile in Afghanistan, one of Bruno's old army comrades is helping to smuggle a young French Muslim with a murky past back to France, and the FBI aren't far behind . . .

Bruno must unravel these mysteries and find his own way to protect his town, its people - and his life.