On May 17th, 1968 nine Vietnam War protesters led by Daniel and Philip Berrigan, walked into a Catonsville, Maryland draft board office, grabbed hundreds of selective service records and burned them with homemade napalm. “Investigation of a Flame” is an intimate, experimental documentary portrait of the Catonsville Nine, this disparate band of resisters who chose to break the law in a defiant, poetic act of civil disobedience.