Season 2, Episode 3:
Someone is hacking into MI-5's central computer. Files are disappearing and agents are being lost in the field. The number one candidate is a secondary school teacher, Gordon Blaney (Chris Fairbank), who is face-matched near an offending computer. MI-5's files link him to a violent socialist group, and terrifying assaults and protests. Zoe is placed in the school undercover, while Danny tries to infiltrate the socialist group.
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