Mysterious Crossing (1936)

"Mysterious Crossing" is a 1936 Mystery movie directed by Jefferson Parker and starring by James Dunn, Jean Rogers. While crossing on the train ferry to New Orleans, roving reporter Addison Francis Murphy borrows money from singing hillbilly "Carolina," then loses it all in a crap game. Outside on deck, Murphy sees two men shaking hands, and after he looks away, hears a splash of water and discovers both men have disappeared...