J. S. Fletcher 
Dead Men’s Money [PDF ebook] 

When an old seaman named James Gilverthwaite shows up in the sleepy town of Berwick looking for long-term lodging, it seems innocent enough. But within days, it becomes clear that Gilverthwaite is looking for something. Soon, a young clerk whom the sailor has asked for assistance is drawn into the mystery — and what first appeared to be an old man’s harmless lark results in murder.