This girl," he continued, looking at me, "knew no more than you, Wood, of the disgusting secret: she thought all was fair and legal and never dreamt she was going to be entrapped into a feigned union with a defrauded wretch, already bound to a bad, mad, and embruted partner!
There are no more uses of "wretch" in the book.
Show samples from other sources
Pity the poor wretch.
If you pay the blackmail, you will remain at the mercy of the unscrupulous wretch.