This feature documentary tells the story of Mohammed Emwazi's journey from being an ordinary London boy to becoming terrorist 'Jihadi John', and the intelligence operatives' attempts to catch him by the US and British military and intelligence services.
It explores the twisted worldview espoused by ISIS - the richest and most notorious Islamist terrorist organization in history - and its propaganda machine which was operated by "Jihadi millennials" who turned social media sites such as Twitter and YouTube into recruitment platforms. Told through extraordinary first-hand accounts of key counter-terrorism and intelligence officials who identified "Jihadi John" and the voices of Muslim community leaders who worked with parents whose radicalized children fled places such as the US and Britain to join ISIS on the battlefields of Syria and Iraq.

The self-proclaimed 'Islamic State' is a jihadi militia active in the north and east of Syria, and in the west of Iraq, which has shocked the world with its cinematic staging of horrific acts of violence and its unexpected advances towards statehood. But why could IS expand so rapidly?