Three years in to Syria’s civil war, rebel forces aren’t just fighting the Assad regime. They’re also vying for control against a group known as ISIS. FRONTLINE correspondent Muhammad Ali — a Syrian native himself, and one of only a few reporters to make it safely into, and then out of, Syria’s northern front in recent months — delivers a gripping report from inside a country in turmoil.A startling portrait of everyday life in a war zone, through the eyes of children.