In Neely Tucker’s latest Sully Carter mystery, Murder, D.C., when the son of one of Washington, D.C.’s most influential families is found dead in the Potomac River, near a drug haven, a newspaper reporter has a hunch there is more to the case. Providence Noir, edited by Ann Hood, is a darkly hued tour of the city in all its nooks and crannies. With gentrifying Brooklyn as the backdrop, Nelson George’s The Lost Treasures of R&B, third in the D Hunter mystery series, is a tale of gunfire, deceit, police corruption, and the sacred code of the streets.