The "Whip Hand" you are referring to is no doubt the one written by W. Franklin Sanders [Charles Willeford], and published by Fawcett Gold Medal in 1961.
This is an important noir novel and Willeford is recognized as an important writer in that genre.
You can BUY the ebook from Amazon.com for $2.49
Here is the link:
https://www.amazon.com/Whip-Hand-W-F...=UTF8&qid=&sr=