The Quiet American by Graham Greene
Into the intrigue and violence of 1950s Indo-China comes CIA agent Alden Pyle, a young idealistic American sent to promote democracy through a mysterious 'Third Force'. As his naive optimism starts to cause bloodshed, his friend Fowler, a cynical foreign correspondent, finds it hard to stand aside and watch. But even as he intervenes he wonders why: for the greater good, or something altogether more complicated?