The latest threat to the gang at GCHQ is personal and with the future of CySec at stake, the members of the team have to go rogue to save their reputations and their jobs.

Jerry is flying high and hailed a hero by GCHQ and the NSA and facing opportunities for promotion on both sides of the pond. Joseph, meanwhile, is dealing with the harsh reality of no longer being part of the team, having been fired by Christine for gross incompetence.

Christine informs Jerry that the Russians who are holding Mary's mum hostage are demanding him in exchange for releasing her.

It's Harassment and Discrimination training day at CySec but all is not what is seems with the course leader, Hilary Bowen. It seems that alpha Jerry, who's used to getting away with behaving how he wants with little consequence, may have met his match?

A rival GCHQ team have unearthed important information about Eternal Blue, the cyber weapon which the Russians have got their hands on. But to Jerry's frustration, they won't share the intel, which he needs to thwart the attack and more importantly further his own career and secure his path back to the NSA. So when he finds out that Joseph has a date with Charlotte, a colleague from the rival team at GCHQ Bude, he seizes the opportunity.

Jerry is hailed as the hero as disaster is averted at the nuclear power plant - but threats still loom large. Meanwhile, the CySec mole is exposed.

Jerry and Joseph are tasked with saving a nuclear power plant under cyber attack.