The United States entered World War II with a new weapon: a bomber fleet that it believed would decide battles from a distance, without the face-to-face slaughter of a land war. The US was also determined to fight the war in Europe without targeting civilians. But conquest in Germany presented moral conundrums and challenged the concept of "civilised warfare”. Through interviews with veterans, historians and ethicists from countries engaged in WWII, uncover the story of the British and American bombing campaigns against Germany, exploring the unavoidable ethical debate imposed by the reality of the war.