When a highly skilled IS sniper escapes from a targeted missile attack in Syria, Spider Shepherd makes sure to remember his face - which comes in handy when the same man turns up on a list of IS fighters who have already been smuggled into the UK.

But Spider's working a different mission - posing as a hit man working for a crime family in South London, in order to eventually take them down. Then, when Spider attends a huge boxing match at a London stadium along with thousands of members of the public, he spots other IS fighters from the list in the crowds, and realizes he's about to be caught up in a large-scale terrorist attack.