Assassination by drone is a subject of deep and enduring fascination. Yet few understand how and why this has become our principal way of waging war. Kill Chain uncovers the real and extraordinary story; its origins in long-buried secret programs, the breakthroughs that made drone operations possible, the ways in which the technology works and, despite official claims, does not work. Taking the reader inside the well-guarded world of national security, the book reveals the powerful interests - military, CIA and corporate - that have led the drive to kill individuals by remote control. Most importantly of all, the book describes what has really happened when the theories underpinning the strategy -- and the multi-billion dollar contracts they spawn -- have been put to the test.