MI-5 investigate a radical mullah, Mohammed Rachid, who seems to have taken control of a mosque in Birmingham. Their investigation takes on a greater urgency when an informer advises them that that the group is planning a suicide bombing. Tom tries to get help from the now disgraced Tessa Phillips, but she declines. A new recruit to the team, Ruth Evershed, recognizes Ibhn Khaldun who has recently been arrested on an immigration charge. He agrees to help MI-5 in exchange for a British passport but the Security Service is just a bit leery of having an agent just fall into their lap. Tom tries to get his personal life on track and goes out with the attractive doctor who recently treated Danny.
—garykmcd