The Lew Archer novels of Ross Macdonald are some of the best private-eye novels written, forming a sort of gumshoe Holy Trinity with Hammett and Chandler. Penguin UK have snaffled some of them for their Modern Classics range (to go with some other surprising but welcome crime-writing additions to that series), and have employed Edward Bettison to do the cover designs, with more than a hint of a stylish late-'50s, early-'60s vibe.
It's a pity the excellent Black Money isn't part of the set.
I'm also rather partial to the current US covers for the Archer books, put out by Vintage US/Black Lizard, which do a great job of playing up the noir aspects of their atmosphere.
All of these are quite a step away from the skin/boob-tastic covers inflicted on the books by Fontana at the tail end of the 1970s.
That last cover troubles me: is the target trapped under a breast? Between the cheeks of an incredibly lopsided arse? Clutched under a bingo wing?