Isaac's paranoia intensifies in the wake of his hacked TV interview, and his family ties are put to the test when claims about his 'love child' become headline news. Reporters circle the family home, forcing Simone to leave with their children – after which Isaac's outburst against the media is filmed and goes viral. Isaac's digital doppelgänger sets up an interview for him on BBC Breakfast, during which the results come in for his paternity test. S015 widen their search for the invisible assassins and recalibrate their thinking as to who might be behind the attacks. Garland discovers a new perspective on the CIA's Frank Napier and Carey feels the net tightening around her as allegiances buckle and shift.

The net tightens. After DCI Carey is kidnapped, her instincts are proved right – but she's in more danger than ever before, while Isaac Turner pursues his own agenda.