Hungry Joe was a jumpy, emaciated wretch with a fleshless face of dingy skin and bone and twitching veins squirming subcutaneously in the blackened hollows behind his eyes like severed sections of snake.
There are no more uses of "wretch" in the book.
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Pity the poor wretch.
If you pay the blackmail, you will remain at the mercy of the unscrupulous wretch.