A. E. W. Mason 
Four Corners Of The World [EPUB ebook] 

When Archie Cranfield’s father asked Mr. Twiss to look after his son as well as advise him financially, the solicitor had no idea what he was agreeing to. A furtive smile permanently etched on his face, Archie lives alone in the countryside. His neighbors do not like him, and Captain Brayton, a former schoolmate, had a falling-out with him years ago and has not seen him since. Then the oddest surprise of all-Archie invites Brayton for a weekend visit and the captain winds up dead. Is it suicide, or is the young Mr. Cranfield as guilty as he looks? (Goodreads)