Left on Purpose is a documentary film about the friendship between an aging anti-war activist who has decided that his last political act will be to take his own life and the filmmaker who is struggling to tell the story.

Midway through the filming of a documentary about his life as an anti war activist, Mayer Vishner declares that his time has passed and that his last political act will be to commit suicide - and he wants it all on camera. Now the director must decide whether to turn off his camera or use it to keep his friend alive.