My Son the Jihadi

In 2011, Sally Evans made a devastating discovery - her eldest son, Thomas aged just 21, had left their home in a Buckinghamshire village and travelled to Somalia to join a deadly Islamist terrorist group. Thomas had been recruited to Al Shabaab - an Al Qaeda affiliate, it is the jihadi group behind multiple atrocities in Kenya, including the Westgate shopping attack in which nearly 70 people were killed and 175 injured. Thomas became the only known white British man to join the terror group. (channel4)