The Spy Who Came in from the Cold

This is a masterpiece of the mystery genre, pure and simple. Few books have captured my attention as this work did - without even trying, at that.
Written by le Carré at the height of his literary prowess, it details the story of a British spy - whose last mission is to plant himself in Soviet-occupied East Germany, to get the Russian spy division head assassinated.
Although the plot looked trite and banal in the beginning, I slowly realized that reading this work was like peeling the layers off an onion - there's so much more to it than meets the eye at first glance. And boy oh boy, it didn't disappoint one bit.
Right when you think that you've got the plot all figured out, it turns out you didn't. The best part is, that action is sidelined in favor of dialogue, which I'm actually in favor of - two of the best scenes in the book were simply long dialogue chains.
TL;DR - deserves space on every reading shelf (or device) - this is the tour de force of an unparalleled writer, and it (deservedly) holds its place amongst the classics. Must read.