«Man Overboard!» by Francis Marion Crawford

Francis Marion Crawford (August 2, 1854 - April 9, 1909) was an American writer noted for his many novels, especially those set in Italy, and for his classic weird and fantastic stories.
"Man Overboard!" - This is one of his stories.
Peculiar happenings aboard the schooner Helen B. Jackson when one night during a storm, the small crew found themselves diminished by one. Somebody had gone overboard, and it was surmised that it was one of the twin Benton brothers. But oddly enough, it seemed that the ‘presence’ of the missing twin continued to exist on board during the following weeks. For example, one extra set of silverware was found to be used after each meal, but nobody claimed to be using them. What then did happen that stormy night, and which brother, if indeed it was one of the brothers, was the man who went overboard?
Among the most significant works Francis Marion Crawford: Man Overboard!, The Doll's Ghost, The Upper Berth, For the Blood Is the Life, The Screaming Skull, Ave Roma Immortalis, Khaled, A Tale of Arabia, Corleone: A Tale of Sicily, Fair Margaret: A Portrait, Mr. Isaacs, A Tale of Modern India, In the Palace of the King: A Love Story of Old Madrid, Marietta: A Maid of Venice, Casa Braccio, Ave Roma Immortalis, The Little City of Hope: A Christmas Story, Cecilia: A Story of Modern Rome, Paul Patoff, The Diva's Ruby, Arethusa and many more.