The BBC drama continues tonight and sees Pine now firmly embedded in Roper's organisation and involved in an arms deal, but his relationship with Jed and Corky's growing jealousy may jeopardise his cover. Burr puts pressure on Apostol to help her translate the information she has received on Roper's offshore operation, but begins to suspect the arms dealer has been buying weapons from the British government - a fear that Palfrey confirms. A tip-off leads her to Istanbul, but her attempt to catch Roper in the act puts Pine in further danger. Superb cast including Tom Hiddleston, Olivia Colman and Hugh Laurie.