Originally titled Hell Hath No Fury and published in 1953, The Hot Spot is "what many consider to be the ultimate Charles Williams book" according to Rick Ollerman. That may be true, but the other novels by Williams I have read are not far behind.
The Hot Spot includes all the tropes that made the paperback originals of the 1950s a commercial success. A drifter down on his luck, a get-rich-quick scheme that can't miss (until it does), a villain we love to hate, a good woman who could make our hero happy, and a bad woman who takes him for everything he's got.
The Hot Spot has the intricate plotting of Nothing in Her Way and Dead Calm, and excels in evoking the the hero's terror as he struggles to carry out his schemes.
Despite excellent storytelling, Williams never became a household name. There was no major Hollywood film adaptation of his work in his lifetime. Even now, it's difficult to find used paperback copies of his novels. Most are available as ebooks.