Murder at Lilac Cottage — John Rhode

In a largely peaceful village in England during the early stages of the Second World War the body of the young man who owns Lilac Cottage is found dead. The only clue that the investigating officers of  Scotland Yard can find is a five pound note, but it lures Priestley to the trail. A second murder takes place nearby soon afterwards, puzzling to most, but to Priestley it confirms the theory he is already developing.