The war film is one of cinema's most enduring genres; nearly every major conflict of the past century has been depicted on screen--multiple times. Films that wrestle with the rapidly changing nature of war, though, are rarer. As drone warfare continues its slow march into public consciousness, Eye in the Sky is the best movie yet to tackle the legal and moral quagmire surrounding modern technological warfare. To do that, Eye in the Sky goes granular, telling the story of one particular mission on one particular day. In the movie, opening wide today, British colonel Katherine Powell (Helen Mirren) oversees a secret operation to capture a terrorist cell in Nairobi, Kenya.