The film tells the story of five journalists who fought to reveal the truth about the Vietnam War. They all went on to win Pulitzer Prizes.
Almost 25 years have passed since the town of Halabja in northern Iraq suffered the worst chemical weapons attack ever perpetrated against a civilian population.
At least 5,000 people are thought to have died in what is now seen as a campaign of genocide launched by Saddam Hussein against the Iraqi Kurds.
The BBC’s world affairs editor John Simpson was one of the first international journalists to reach Halabja in 1988, and he went back to meet some of the survivors.
Experts share a range of perspectives on how to combat the Islamic State militant group, and the role the U.S. should play.