An MI5 officer's attempts to foil a possible terrorist plot are undermined by bureaucracy and moral dilemmas. Will he make the world a safer place or be complicit in making a tense situation even worse?

• Many Rivers Film
• Channel 4 Television
• David Oyelowo
• Stephen Campbell Moore
• Sebastian Armesto
• Monica Dolan
• Paul Ritter
• Arsher Ali
• Nasser Memarzia
• Shonn Gregory