Old Ugly-Face by Talbot Mundy

Andrew almost bumped into Lewis. At the far end of the hallway at the foot of the stairs, the Lepcha servant sat on a chair beneath a Tibetan painting of the Buddha. He looked dazed. Obviously Lewis had been talking to him.

-"Bad case," said Lewis, glancing at the servant and turning his back. "That poor fellow is a sample of secret vice at war with conscientious love of his employer. He relies on the one to condone the other--hides in the one to forget the other. But it can't be done. One fights the other, almost like a chemical reagent. That leaves him feeling physically weak and morally helpless. He craves relief from self-contempt, so he mentally almost leaps to meet the first hypnotic influence that comes along. Bulah Singh was like a magnet to a bit of scrap iron. Nancy will have a hard time helping that poor fellow to rebuild his self-control."