A rival GCHQ team find important information about the cyber weapon Eternal Blue, but when they refuse to share it, Jerry must think of a solution, which may rebuild his reputation.
It's a harassment and discrimination training day at CySec but not everything is as it seems with the course leader, Hilary Bowden. Meanwhile Jerry comes to the conclusion that he may have met his match.
After saving the day, Jerry is flying high, hailed as a hero by GCHQ and the NSA and facing opportunities for promotion on both sides of the pond. Meanwhile Joseph is dealing with the harsh reality of no longer being part of the team.
When Jerry admits that he has slept with Tuva, Joseph is devastated. But when he learns that Jerry is married he begins to question their whole friendship. Having failed her appraisal, Christine attempts to soften her style.
When the NHS servers are hacked the whole team are forced to work through the night. Jerry finds the work tedious and coerces the rest of the team into tracking down the culprit behind the attack his own way.
When Jerry learns that his best friend Clint, an FBI Agent, has been sleeping with his wife he accidentally shoots him. When Clint shows up at GCHQ with an extradition order for Jerry, the staff stage a wedding to protect him.
Jerry suggests the person behind the cyber attack on GCHQ should join the team. But Joseph becomes jealous of Jerry's cool new friend and looks to change his image and win back Jerry's affection.