Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
Hunting Shadows is one of Charles Todd's Ian Rutledge mysteries - Rutledge returned from the Western Front to his pre-war job at Scotland Yard in 1919 with a secret - he suffers not only from shell shock and claustrophobia (from being buried alive), but also has a dead Scot named "Hamish" living in his head.
By this point in the series it is the summer of 1920, and there have been two murders in the fen country of Cambridgeshire which mystify the local authorities, and they have called in Scotland Yard. First a guest at a society wedding in the medieval cathedral town of Ely was killed by a rifle shot, and then a solicitor standing for office was murdered, in the same fashion, while making a campaign speech in his rural constituency. There was a witness to the second crime, but after the local constable and her neighbors mocked her account of seeing a "monster," she has clammed up completely.
Scotland Yard sends in Inspector Rutledge, who finds he must discover the facts of past events to find the truth of those in the present. And it's like finding a needle in a haystack, or "hunting shadows" in a fen country fog.
I found this mystery well constructed, and the setting, reminiscent of Dorothy Sellers' Nine Taylors, well done. However, the cover, though getting the suggestion of fog right, suggests a "pea-souper" in London, rather than the actual rural and small-town setting that makes up the majority of the book.