While dozens of parties are fighting IS on just as many fronts, Rudi Vranckx travels along the front lines of this totally new kind of war. He travels from battlefield to urban war, as well as to the deepest catacombs of the internet and encrypted messaging apps. He meets soldiers, ex-jihad fighters and cyber analysts, hopeless and combative civilians. At the same time, he also tries to form a picture of the opposing party, through the stories of IS prisoners, deserters and child soldiers. Each and every one of them offers a glimpse into the dark heart of IS.