The Lodger (based on the Jack the Ripper murders)

"Then his voice sinking to a whisper he hissed out ‘Your end will be bitter as wormwood and sharp as a two-edged sword. Your feet shall go down to death and your steps take hold on hell.’” The Lodger is a 1913 novel by English author Marie Adelaide Belloc Lowndes based on the Jack the Ripper murders of 1888. The book tells the story of Mr. and Mrs. Bunting owners of a failing lodging in London who see in Mr. Sleuth their only guest in a long time their chance to salvage their business. As new murders happen in the surrounding neighborhoods the couple becomes suspicious of this new arrival.