I’m a huge fan of the crime novels of W.R. Burnett, most of them as good, many better, than the more famous movies adapted from them: Little Caesar, The Asphalt Jungle, Iron Man (hard to find but worth it, with some chapters as good as anything Hemingway ever wrote, just considered as prose) and, my favorite Burnett novel of all, High Sierra, way superior to the excellent movie based on it.
Also excellent, Grahame Greene, whose novels are now considered classic. Where to begin? Well, The Quiet American, The Heart Of The Matter, Our Man In Havana, The Human Factor and, from earlier on, Orient Express and Brighton Rock. So many to choose from. Most local libraries should be well stocked with Greene’s novels.
On a more modest level, and still highly entertaining, the novels, especially the early ones, of Eric Ambler, a “spy specialist” whose novels of intrigue are often set “somewhere in the Levant”, or nearby. Two well known early ones: Journey Into Fear and A Coffin For Dimitrios. His later novel, The Light Of Day, was adapted into the charming movie Topkapi.
Ray Bradbury has already been mentioned, however two other masters of the short story, John Collier and Roald Dahl, deserve a mention. Also, for darker subject matter, Cornell Woolrich is tough to beat.
As for crime fiction, just about any novel by Raymond Chandler is, if you’re in the right frame of mind, and enjoy reading a book by someone who obviously loves writing, Chandler is a joy. The somewhat similar but less flamboyant James M. Cain is also good but more journeyman. Chandler was a master of the English language who, had he been born at a different time, had a more ambitious disposition, could have been one of the “greats”.