Series Outline
When Julia Stapleton joins Moriarty & Co, she believes she knows exactly what she’s doing. Brilliant, highly educated and already tainted by scandal, Julia appears to be another morally flexible consultant drawn to a prestigious London firm that pays well and asks few questions. In truth, she is infiltrating the company very deliberately. Moriarty & Co was responsible for the violent rupture that destroyed her family, and Julia is determined to uncover the truth about its past - and about her father, who vanished during a particularly bloody period in firm’s history.
What Julia doesn’t yet understand is the scale, sophistication and patience of the organisation she is stepping into.
Moriarty & Co is a consulting firm like no other. For decades, it has advised the world’s most dangerous criminal enterprises, while hiding in plain sight as a legitimate professional services company. Its consultants pride themselves on distance: they plan, analyse and advise, but never commit crimes themselves. That distinction - legal, ethical, psychological - is what allows the firm to function. But as the world gets more complicated and competitive, this is increasingly under strain.
Julia arrives at a moment of internal upheaval. Sarah Ripley, once a rising star of the ‘legitimate’ financial world and now head of the firm’s most profitable division, has just been made a Senior Partner, vaulting her into the Inner Circle, where the truth about Moriarty & Co’s clients is finally revealed. When she finds this out, Sarah feels let down and angry, She has been lied to by the Managing Partner, Leslie Armstrong, the firm’s long‑time leader and architect of its criminal success. She becomes determined to modernise the firm and steer it towards legitimacy, but her ambitions place her on a collision course with Armstrong. He has spent years building Moriarty & Co into a global criminal force. But the world is changing, the Board is restless, and his grip on power is slipping.
Sarah takes Julia under her wing. She sees in her a version of herself: smart, driven, willing to bend the rules to get ahead. To Julia, Sarah is a mentor and a shield - someone who can fast‑track her rise inside the firm and grant access to its most closely guarded secrets. Neither woman fully realises how much they are already shaping each other.
As Julia begins work on a series of high‑stakes assignments, the reality of Moriarty & Co’s operations becomes clear. The firm doesn’t simply advise criminals; it embeds itself in their businesses, identifying vulnerabilities, anticipating threats and quietly managing disasters when things go wrong. Clients are starting to demand more involvement, faster responses and absolute discretion. The line between strategy and execution blurs as Armstrong tries to keep clients happy. But under pressure from an important client, Armstrong has inadvertently allowed the firm to be exposed, and the police have their first hard piece of evidence that Moriarty & Co really exists.
As Julia grapples with the assignments she is given, she treads the fine line of delivering top notch work, whilst quietly sabotaging her clients. Small decisions are nudged the wrong way, assumptions are subtly undermined, vulnerabilities are understated or missed entirely. The outcomes are never catastrophic enough to draw suspicion, but criminal operations falter, plans unravel, and clients begin to fail in ways that can’t quite be explained. Each act of sabotage brings Julia closer to the truth she’s seeking, but also leads her deeper into danger where even minor miscalculations can have lethal consequences.
Watching everything is Kin‑Ming Chan , the firm’s Head of Internal Security. A former undercover operative himself, Kin‑Ming knows how infiltration works, and he knows exactly how dangerous it can be. As unexplained access, missing data and subtle irregularities accumulate, he begins to suspect that someone inside the firm is not who they claim to be. His investigation is methodical and patient – and, with his investigation leading back into the firm’s history, Julia is closer to the centre of it than she realises.
Across the series, two dangerous games play out in parallel. On the surface, Sarah and Armstrong are locked in a ruthless struggle for control of Moriarty & Co: its future, its clients and its identity. Beneath that, Julia and Kin‑Ming circle one another in a quieter, more lethal contest of concealment and discovery. Each believes they are manipulating the others. All of them are wrong.
As Julia uncovers fragments of the firm’s hidden history, she is forced to confront an unsettling truth. Moriarty & Co does not simply destroy people - it transforms them. The same instincts that allow Julia to infiltrate the firm are the ones it rewards. Power, protection and belonging are offered in exchange for loyalty and silence. The deeper she goes, the harder it becomes to tell whether she is derailing the corruption - or being groomed into it.
By the end of the Season One, long‑buried secrets surface, alliances fracture, and the cost of survival inside Moriarty & Co becomes brutally clear. Julia must decide how far she is willing to go for the truth - and who she is prepared to become in order to get it. And Sarah is forced to confront a devastating possibility: that in shaping Julia to thrive at the firm, she may have created either her closest ally – or her replacement.