In Berlin, the Good Shepherd Cybersecurity team are on a covert mission to extract information about Cyrus’s sinister intentions. Meanwhile, in Romania, a monstrous operation is silently getting into gear.

Who knows which way Mark will fall? His new permanent position will give him the chance to work from the ‘inside’, but there are signs he has a real conscience, that he cares about his colleagues. Fiona introduces him to newbie Charlotte and it’s obvious she wants the two of them to strike up a friendship. It’s pretty awkward. Mark has hopeless social skills.

Erica comes to Mark with a problem. She’s fallen prey to a ransomware attack and needs him to sort it without alerting their colleagues. Mark’s response shows he’s got her back. She owes him a favor now. The Controller threatens to deal with Erica and Mark has to create a web of lies to protect his Khromacom family.

Hacker Mark, aka 'Romulus', tail-gates his way right into the Khromacom corporate HQ where the IT Team are fire-fighting a cyber-attack. He secures a job on the IT security team, much to the satisfaction of his sinister handler, 'Mother'.

‘Romulus’ is ready to ship out of his fake life as Mark Shepherd. He’s just about to send the crucial upload of killer information to his masters when AJ stops him. It’s Red Nose Day and the Khromacom gang are ready for some shenanigans. He’s completely torn when his boss offers him a full-time contract.

AJ catches Mark trying to ‘phish’ Erica for financial information on the merger. Mark brushes this off as a phishing test for all the company. He asks AJ why he is so loyal to the company but AJ explains it’s about the people. Undeterred, later that night Mark downloads all Erica's confidential files.

Even before his first day Mark has been interrogating the social media accounts of his new colleagues. They seem like a fun and slightly random bunch of people who love to overshare. He’s tasked with getting security tightened while learning some useful info on the big merger.

Mark has a hunch that Erica will be targeted at a big finance conference, so he gets assigned as her security detail. To Mark’s shock and dismay, ‘Mother’ breaks cover. In the guise of an American businessman he charms Erica into divulging information despite Mark’s best efforts to protect her.

It’s 2am and Mark is disguised as a cleaner to target Erica’s office. Her desk and office walls are covered with papers that might be useful. He steals a notebook from her desk. Later the next morning he has a tricky conversation with her while trying to sneak it back in. ‘Mother’ piles on the pressure when Mark starts to ask awkward questions about the ‘sting’.

Mark is running into a brick wall on Khromacom’s network security so he calls on an old contact ‘Rat’ to dumpster dive for confidential documents people may have casually disposed of. When he returns to his desk he is shocked that the guys have made a surprise party. He’s completely thrown.

‘Mother’ or Maurice as we find his real name to be, is sure that he can keep the operation on the road. He uses Mark’s past to try to blackmail him. He tests the security guy’s sincerity in turning over a new leaf. Meanwhile AJ gets his big break and a new security star is born at Khromacom. Think all the loose ends are tied up? There’s always a twist in the best thrillers.

This adversary is relentless. Mark and AJ know that just because an attack has been thwarted, they will just keep coming. The information hacked from ‘Mother's' phone leads them to a USB key, surreptitiously handed to Erica by the American businessman. If she plugs it into her laptop the game is up, the confidential information about the merger will be extracted by ‘Mother’s’ terrifying masters.

Mark realizes he can’t do this on his own. He recruits AJ into the game. It’s risky but there’s no alternative. ‘Mother’ calls a clandestine meeting in a deserted underground car park. It looks like Mark’s plan will be thwarted when the Controller takes his phone. Is the countersting over before it gets started?

Disastrously, despite all advice, the energy company’s CEO is planning to cave in to the ransom demand. Mark buys time, promising his team will extinguish the threat in days. Maurice is as elusive as ever. However, the arrival of a Europol agent on the scene brings some nervous moments for both him and Mark.

Good Shepherd Cybersecurity is invited to deal with the energy company’s ransomware attack. Mark advises the CEO not to pay the ransom at any cost. It’s not clear if he’ll take Mark’s advice. George, Mark and Violet’s estranged father, makes an unexpected appearance. There are clearly serious questions to be answered.

Charlotte steps up her social engineering activity, manipulating fellow employees through vishing and impersonation. She’s an impressive adversary and even the security team are not immune. Mark finds himself teaming up with an unlikely ally to try to combat her and her controller, the mysterious ‘Aunt Margret’.

e.v.e’s launch day minus one and Charlotte is showing herself to be as skilful an actor as she is hacker. Maurice is forced to cash in some old favours, no matter how far flung, or how deep ‘undercover’, to find out who’s really behind the growing web of conspiracy. Meanwhile AJ is having doubts about his friendship with Mark, who seems worryingly distracted and evasive. Not surprising really, after a game-changing revelation that no-one saw coming.

It’s the day of the big launch. The excitement and the threat levels around e.v.e are through the roof. AJ and Mark take the team through the critical security protocols. Meanwhile Charlotte impersonates her way into a bedroom at the launch event hotel. So at last we come to the final showdown. Mark is going to have to draw on all his powers of persuasion to save Charlotte, but time is running out.

Finally, all of the secrets are laid bare, all of the webs of deceit unravel. The revelations come thick and fast for Charlotte, AJ and Dev. By the end of this emotional and tense episode everything they thought they knew will be turned inside-out. Who will emerge on the side of truth? What will happen to all those treasured friendships and loyalties? In a stunning revelation the betrayer will be betrayed.

Mark and AJ face the aftermath. In the remains of the e.v.e launch they survey a world seemingly turned upside-down. So many questions are still unanswered. Can their friendship survive? Could someone really end up in jail? And maybe most important of all, where is Charlotte? All will be revealed and more in this intriguing and uplifting Season finale.

Good Shepherd Security’s crack team is carrying out a sophisticated penetration test, involving AJ in a bee costume. The stakes are sky high, as the ‘sting’ has been commissioned by an international bank. There’s a lucrative contract to be had, but Maurice seems to have gone missing and the bank’s multiple layers of physical and data security could thwart the operation at any stage. The team is going to have to bring their ‘A’ game, including Fiona who, as it turns out, has some impressive improv skills.

Mark, Maurice and Fiona have a crucial meeting with Christina Mendoza, the CEO of GBT Bank. The outcome could transform the rocky fortunes of their fledgling company. Meanwhile AJ is engaged in an important bit of ‘outreach’, sharing his security insights and enthusiasm. It’s a tough crowd until he lets slip that he works with a ‘white hat hacker’. Great news, it’s game-on for Shepherd Security - but could this be a job too far?

The planning for ‘Operation Verité’ is in full swing. Mark and AJ are excited to be deploying their hacker capabilities but unexpectedly come up against an obstacle that may threaten the whole business. Fiona finds herself having to deploy an entirely new set of skills. Thanks to her they live to fight another day, but there’s a high price to secure her loyalty.

AJ is terrified how Fiona will react to the revelations about Mark’s past. It looks like the game is up before it even gets going. Maurice, who is supposed to be ‘cleansing his karma’ seems to think honesty is the best policy but admits he knows little about Mark Shepherd’s dark past. And there’s Fiona’s mum too. She’s turned out to be unexpectedly forthright with her daughter’s team-mates. Could this mean trouble?

AJ informs the team that a fake calendar request to the initial phish victim enabled the hackers to access vital engineering systems. George tries to explain his motives to Violet, but she isn’t convinced. Mark in the UG & E war room thinks he has worked out the nuts and bolts of the hack. He sends in Lars in Norway to rectify the situation, but there is a terrifying reaction.

Mark has enlisted Lars to locate the threat in the plant’s underground system of tunnels and comes to a stunning realization about the real nature of the attack. Thanks to a USB key, AJ manages to persuade a sceptical CEO that security training needs to happen. Meanwhile, Fiona sees something that triggers her own doubts about Violet when she runs an errand at Mark’s home.

Mark and AJ have an exciting ride out to inspect one of the stricken gas terminals, thanks to an old friend. In the offices, the GSC team watches nervously as Mark heads out into the deserted control room. The monitoring systems at the facility are going critical. Charlotte’s reaction when Lars and Mark are successful is beyond anything witnessed before.

Maurice enlists Deathrage to do a little cyber-snooping on Agent Castillon to see where her loyalties lie. AJ’s growing social media presence secures an approach from a hugely popular influencer whose social media feeds have been hacked and damaging deepfake messages have been posted. Maurice reveals his old life is very much alive alongside the Zen guru persona.

Violet has a flashback to the moment when 16-year-old her was finally able to cut loose from George. Back in the present day, George tries to persuade Violet to get some old tech off Mark allegedly to protect him. Later, Violet is instrumental in putting together the response to deal with Rosie May’s social media crisis: an ingenious deepfake.

Violet and AJ have worked out the scarily simple mechanism behind the hack of Rosie May’s social media feed. The influencer is delighted, and everyone at GSC is in a celebratory mood. Mark and Violet seem to have worked past their differences and are bonding over an old gaming console. Never short on surprises, Maurice brings an unexpected guest to the party.