Sin Hellcat was originally published in 1961 under the pseudonym Andrew Shaw. Unfortunately, the kindle version has the boring Open Road Media plain black cover rather than the racy softcore cover of the
original dime store paperback which featured a nude redhead guzzling
a bottle of champagne and included the tag line: "life was one lust-filled orgy for this Sin Hellcat." That's not really what the book's about but it's an eye catching title.
The basic story is that a guy (Harvey Christopher) is trapped in a boring marriage to frigid wife Helen and decides to look up his old college sweetheart (Jodi) who is now working as a prostitute and she
gets him involved in international smuggling.

Harvey reminisces about college days with Jodi at the reservoir, in her dorm room, and wherever. He also reminisces about how he landed his first job in advertising by meeting a guy in a bar and how he schemed and worked his way up.
His story of his frigid honeymoon is absolutely hilarious. But now he's reconnected with Jodi: Jodi's large soulful eyes were even deeper now and "her body had filled out very nicely." She has "honey-blonde hair" and is extremely distracting in a green sheath dress. And Harvey can't get enough of her. Good thing too because he has agreed to travel with her to South America traveling as man and wife
to smuggle a valuable item out of the country.

It's a fun story, well-told and worth reading. As Block brags in an afterword, it's impossible to tell who wrote which chapter, Block or Westlake. ( )