Syrian Journalist Masoud Aqil spent almost nine months in the hands of so-called Islamic State, facing torture and death threats. In September 2015 a prisoner exchange secured his release. Now the one-time prisoner of terrorists has become their hunter, living at a secret location in Germany. With the help of Kurdish contacts, some from within the Syrian-Kurdish People's Protection Units (YPG), and his own online research, Masoud Aqil tracked down suspected IS supporters, including some he became acquainted with during his nine-month ordeal in Islamic State's torture chambers. Some of them are now living in refugee housing in Europe. Masoud Aqil has reported the suspects to German authorities. More and more refugees are following his example. Masoud's List A Report by Frank Hofmann