In its obituary, the New York Times wrote:
John le Carré, the British novelist whose Cold War thrillers elevated the genre to high art, died on Saturday, December the 12th at 89. He left behind a remarkable literary legacy: 25 novels written over nearly 60 years, featuring George Smiley, Alec Leamas and other enduring heroes of spy fiction.
In an appreciation of le Carré’s work, New York Times critic Dwight Garner remarked, “His novels delivered tutorials in how to brood, in fiction, without toppling into pretension.”
If you’ve never read any of le Carré’s novels, or like his spy books and movies based on these books here is where you can find them.