Why do two young Britons become terrorists? Shalima is a young muslim woman; Yusuf was born Ryan but converts to Islam. Both are radicalised and fly to Yemen to join Al Qaeda. Here they are trained and indoctrinated. Meanwhile an Al Qaeda leader is mysteriously delivered to the British embassy in Jordan and then transferred to Belmarsh prison in London. Yusuf and Shalima concoct a plan to rescue him. David, a relapsed Muslim and an MI5 officer, is placed in charge of the operation to prevent the terrorist attack. Will David and his team succeed or will the terrorists keep one step ahead.