WWI, Britain, 1917. A house party on a remote island, a country grieving the loss of its sons, a seance, a spy in their midst. Oh, also the ghosts are real. I‘m not sure the book worked for me 100%, and like many stand-alone mysteries I had little attachment to the detectives, but I was happy to be along for the ride. Great for fans of Jacqueline Winspear and Charles Todd.