Arthur Machen (1863-1947) was a Welsh author and mystic, best known for his influential supernatural, fantasy and horror fiction.
"A Double Return" is a classic doppelganger tale. A successful artist, Hallswell, is returning by train from a painting trip in the southwest of England. As the down train passes him at a junction, he imagines he catches a glimpse of his own face in the train rushing past his window. When he reaches home, a strange and sinister mystery awaits him....