Meet Mark, a man with secrets. This lonely hacker must blag his way into Khromacom's security team and destroy the company. His new colleagues present a heartbreaking dilemma: satisfy his sinister controller or betray his loveable friends?

Somewhere in the UK, an engineer finishes one last, mysterious job before retirement. As a result, a remote facility comes online as a familiar face prepares to resume his quest for vengeance…

After Mark and Charlotte’s walk in the park is interrupted by a familiar face, they learn that Cyrus Barclay’s AI is still at large in the hands of an old ally. Meanwhile, a disreputable accountant gets a concerning phone call.

The Good Shepherd team gathers as Mark and Charlotte bring Fiona and AJ up to speed about Maurice, the AI and MI5’s involvement. Feeling hunted, Volkov is seeking help, unaware that Maurice and the AI are hot on his trail.

Using the AI, Maurice steers Volklov to reach out to an old acquaintance. The Good Shepherd team are on the same trail and realise an upcoming charity gala might give them a chance to find Volkov and track down Maurice.