The Year of the Locust, Terry Hayes

If, like Kane, you're a Denied Access Area spy for the CIA, then boundaries have no meaning.

Your function is to go in, do whatever is required, and get out again - by whatever means necessary. You know when to run, when to hide - and when to shoot. But some places don't play by the rules.

Some places are too dangerous, even for a man of Kane's experience. The badlands where the borders of Pakistan, Iran and Afghanistan meet are such a place - a place where violence is the only way to survive. Kane travels there to exfiltrate a man with vital information for the safety of the West - but instead he meets an adversary who will take the world to the brink of extinction.