In the film , Holland visited the site of the 2015 Bataclan theatre massacre in Paris , interviewed a Salafi jihadist leader in Jordan , and then went to the Iraqi city of Sinjar , which had historically been largely populated by the Yazidi minority . In 2014 , ISIS forces swept into the city and killed most of the Yazidi men and old women , taking the young women as sex slaves and the young boys to train as ISIS soldiers . At one point , Holland was shown approaching a pit filled with the remains of Yazidi women who ISIS considered too old to be used as sex slaves , and then had to vomit off-camera
Bataclan theatre massacre
November 2015 Paris attacks
Tom Holland (author)