I'm a sucker for books set in the Peak District, and for crime novels, so this has to be a winner.
Edendale is apparently based in Hathersage, as seen from Surprise View, but the place has something of the atmosphere of Matlock , to my mind.
The events in this book take place around the Snake Pass and Bleaklow area. Irontongue Hill, (an invented name) is the site of a World War 2 air crash. Investigations of suspicious deaths in the area sixty years later involve the descendants of two of the crew, the only survivor from the crash, and a man who had witnessed the scene as an eight-year-old. There is interesting information on the Polish community, too.
Booth's main police characters Ben Cooper and Diane Fry and the tensions between them hold the story together tightly.