In 2018, under bombardment in Syria, a 2-year-old boy named Salmaan disappeared along with his mother. At the time, the Islamic State was at the brink of defeat. For years, ISIS led a brutal campaign across Syria and Iraq, killing and kidnapping thousands of people. After the war against the Islamic State was won, many of the wives and children of its fighters were placed in prison camps in Northeast Syria. Today, BBC investigative journalist Poonam Taneja on her journey to those camps to find out what happened to Salmaan, and the fate of the thousands of children left behind in the Syrian desert.