Wings of Fire by Charles Todd

Rich with atmosphere, luminous period detail, and human complexity, this second brilliant mystery from the author of A Test of Wills—a New York Times Notable Book of the Year, a Publishers Weekly Best Mystery, and Edgar Award nominee—marks the return of Inspector Ian Rutledge, “a dogged and insightful character whose psychological landscape and continuing recovery are deftly explored” (The Miami Herald).
Inspector Ian Rutledge is quickly sent to investigate the sudden deaths of three members of the same eminent Cornwall family, but the World War I veteran soon realizes that nothing about this case is routine. Including the identity of one of the dead, a reclusive spinster unmasked as O.A. Manning, whose war poetry helped Rutledge retain his grasp on sanity in the trenches of France. Guided by the voice of Hamish, the Scot he unwillingly executed on the battlefield, Rutledge is driven to uncover the haunting truths of murder and madness rooted in a family crypt...