Dead Lions

A Death on the Oxford Coach

Dead Lions opens with a man dying on a bus. Dickie Bow, a former MI5 officer long since retired from anything resembling active service, is found dead between Oxford and London on the National Express. The verdict is natural causes. Jackson Lamb, who knew Bow decades ago in a different kind of Cold War world, does not believe this for a moment.

This is the second Slough House novel, and if Slow Horses established the world, Dead Lions expands it — in both the quality of its plotting and the depth of its characters’ backstories. Mick Herron won the Crime Writers’ Association Gold Dagger for this book, and the award is warranted: this is the novel in which the series demonstrates it can sustain multiple registers simultaneously, moving between comedy, tragedy, political satire, and genuine thriller mechanics without losing its footing in any of them.

The Cold War Thread

At the heart of Dead Lions is a Cold War operation called Cicada — a sleeper network of Soviet assets embedded in British institutions during the 1970s and 1980s, never activated, never properly rolled up. The assets were well-placed. They were also well-hidden. And now someone is activating them.

Herron’s handling of Cold War material is precise rather than nostalgic. He understands the period’s intelligence culture — the paranoia, the ideological commitments, the bureaucratic games played across the Iron Curtain — well enough to use it without sentimentalising it. The Cicada operation has the authentic feel of something that could actually have existed, the kind of long-term dormant asset that intelligence services maintain in the knowledge that they might never be needed and the certainty that if they are, it will be too late to start preparing.

The thread connecting Dickie Bow’s death to Cicada is the novel’s central mechanism, and Herron manages its revelations with skill — giving readers enough to pursue the thread while maintaining genuine uncertainty about where it leads.

The Main Characters Deepen

River Cartwright and Sid Baker carry most of the active load in this novel, but the more interesting development is what Herron does with characters who were background figures in Slow Horses. Catherine Standish, Lamb’s administrator who carries her own complex history, gets scenes that transform her from supporting player to someone whose interior life matters. Marcus Longridge and Shirley Dander — relatively peripheral in the first novel — begin to acquire the dimensionality they’ll carry through the rest of the series.

Lamb himself becomes clearer without becoming fully explained. The hints at his Cold War service are more specific here — we begin to understand that whatever happened to him in Berlin left marks that have never healed and that his assignment to Slough House, which looked like disposal, might have been chosen. The series’s great ongoing question — what does Lamb actually want? — becomes more urgent.

The Plot Mechanics

Herron’s plotting is of a different order from most thrillers. The pieces move deliberately, with each element placed to pay off later in ways that feel inevitable only in retrospect. Dead Lions has a more complex structure than Slow Horses — more moving parts, a broader cast of antagonists, and a timeline that reaches back forty years before the main events.

The central deception at the plot’s core is genuinely clever and genuinely surprising. Not in the cheap sense of a twist inserted at the last moment, but in the deeper sense of a revelation that recontextualises what came before it. When the shape of the Cicada operation becomes clear, the reader experiences the specific pleasure of a puzzle correctly solved — not guessed, but earned.

Diana Taverner

The First Desk of MI5, known as Lady Di to those who dislike her (which is most people), plays a larger role in Dead Lions than in the first novel. Taverner is one of Herron’s great supporting characters — entirely capable, entirely self-serving, and sophisticated enough to pursue her institutional interests in ways that almost resemble principle. Her relationship with Lamb is the series’s most productive antagonism: two people who understand each other completely, trust each other not at all, and are stuck with each other regardless.

The political games at Regent’s Park — promotions, allegiances, the management of damaging information — are rendered with the specificity of someone who has studied how institutions actually function. Herron’s intelligence bureaucracy is not a cartoon of incompetence; it is a recognisable portrait of how ambitious people navigate complex organisations, told with sufficient darkness to make clear that the costs of those navigations are often borne by people who have no idea they’re in the game.

Language and Tone

Dead Lions consolidates the tonal signature that distinguishes the Slough House novels from their contemporaries. The dark humour is sharper here than in the first book — more confident, better integrated, less likely to tip into mere comedy. The sentences are carefully made, with a specific quality of attention to word choice that marks Herron as a genuinely literary writer working in genre.

This matters because the humour is doing real work. Jokes about Lamb’s personal hygiene or the slow horses’ professional inadequacy are not distractions from the serious material — they are the mode through which the serious material is delivered. The gap between how intelligence services present themselves and what they actually do is inherently comic. Herron’s achievement is to keep that comedy from obscuring the human cost of the gap.

Dead Lions is where the Slough House series becomes something unmistakably special. The first novel was exceptional as debut thrillers go. The second is the book in which the series establishes that it has the range and the depth to sustain a long, rich story across many volumes. Readers who have arrived here via Slow Horses will find what they hoped for and more.

Our rating: 4.7/5 — The Gold Dagger is deserved. The series’s full potential becomes visible here.