While THE SPY THAT CAME IN FROM THE COLD remains my favorite Le Carré, this is a close second (though the protagonist here, Justin Quayle, may be my favorite; yes, even more than the ubiquitous George Smiley). At turns thrilling, maddening, and poignant – the Le Carré trademark – GARDENER is also possessed of a deep wellspring of humanity throughout, of identity and understanding found through shared purpose (and the regret that it came too late). Haven't seen Fernando Meirelles's film adaptation since it came out, but might have to revisit at some point. Recommended.

P.S. very excited for Errol Morris's upcoming Le Carré documentary, THE PIGEON TUNNEL.