The Loudwater Mystery

Popular mystery novel, first published in 1920. According to Wikipedia: "Edgar Alfred Jepson (1863 - 1938) was an English writer, principally of mainstream adventure and detective fiction, but also of some supernatural and fantasy stories that are better remembered. He used a pseudonym R. Edison Page for some of his many short stories, collaborating at times with John Gawsworth and possibly Arthur Machen, a long-term friend. He was editor for a short period of Vanity Fair magazine, where he employed Richard Middleton, and did much to preserve the latter's memory. He was also a translator, notably of the Arsène Lupin stories of Maurice Leblanc."