If you’re a fan of gritty spy thrillers with sharp wit and unforgettable characters, Mick Herron’s Slow Horses series (also known as the Slough House series) is a must-read. This critically acclaimed collection is one of the most popular Mick Herron books, following a group of disgraced MI5 agents banished to Slough House, where they tackle dangerous missions while navigating their own flaws and office politics. With the hit Apple TV+ adaptation bringing the series to a wider audience, now’s the perfect time to dive into the books. This guide lists all the Slow Horses books in order, including novels and novellas, to help you read them chronologically and avoid spoilers.
Why Read the Slow Horses Series?
Mick Herron’s Slow Horses series stands out for its blend of dark humor, complex characters, and intricate espionage plots. Led by the brilliant but flawed Jackson Lamb, the “slow horses” are MI5’s misfits—agents relegated to administrative purgatory for their mistakes. Each book delivers high-stakes missions, sharp dialogue, and a distinctly British tone that’s both entertaining and thought-provoking. Whether you’re new to the series or catching up after watching the show, reading the books in order ensures you follow the character arcs and unfolding mysteries.
Below, we’ve compiled the complete list of Slow Horses books in publication order, which is also the recommended reading order for the best experience.
Slow Horses Books in Order
Here’s the full list of Slow Horses novels and novellas in publication order, as of September 2025. This includes all main series books and standalone novellas, ensuring you don’t miss a single story.
1. Slow Horses (2010)
The first book introduces Slough House, MI5’s dumping ground for failed spies. When a young man is kidnapped and threatened with execution, the slow horses, led by the slovenly but cunning Jackson Lamb, get a chance to redeem themselves. This fast-paced thriller sets the tone for the series with its mix of suspense, betrayal, and dark comedy.
2. Dead Lions (2013)
In the second installment, a Cold War-era spy is found dead under suspicious circumstances. The slow horses uncover a decades-old conspiracy that threatens national security. Dead Lions deepens the team’s dynamics and introduces new layers to Jackson Lamb’s mysterious past.
3. The List (2015) – Novella
This novella focuses on John Bachelor, a low-level MI5 agent tasked with monitoring retired spies. When one of his charges dies, Bachelor uncovers secrets that pull him into Slough House’s orbit. Short but gripping, The List adds depth to the series’ world.
4. Real Tigers (2016)
When a slow horse is kidnapped, the team is drawn into a dangerous game involving rogue agents and a powerful politician. Real Tigers ramps up the stakes with intense action and showcases the slow horses’ knack for surviving against the odds.
5. Spook Street (2017)
A terrorist attack in London puts Slough House in the spotlight. As the team investigates, they uncover ties to a shadowy figure from Jackson Lamb’s past. Spook Street is a fan favorite for its emotional depth and shocking twists.
6. London Rules (2018)
With MI5 under scrutiny and a series of seemingly unrelated attacks rocking London, the slow horses must navigate a web of deception. London Rules delivers high tension and explores the personal costs of espionage.
7. The Drop (2018) – Novella
In this novella, a routine surveillance operation uncovers a breach in MI5’s security. John Bachelor returns, teaming up with Slough House to prevent a disaster. The Drop is a compact, suspenseful addition to the series.
8. Joe Country (2019)
The slow horses venture into rural England to chase a rogue agent and uncover a deadly plot. Joe Country blends personal vendettas with high-stakes espionage, delivering some of the series’ most emotional moments.
9. The Catch (2020) – Novella
John Bachelor is back, tasked with retrieving a missing asset who holds dangerous secrets. This quick read ties into the larger Slough House narrative while offering a standalone thrill.
10. Slough House (2021)
A personal attack on the slow horses puts them in the crosshairs of a powerful enemy. As they fight to survive, the team uncovers a conspiracy that threatens MI5 itself. Slough House is a masterclass in tension and intrigue.
11. Bad Actors (2022)
When a high-profile diplomat goes missing, the slow horses are drawn into a political power struggle. Bad Actors combines biting satire with edge-of-your-seat action, cementing Herron’s knack for blending humor and suspense.
12. Standing by the Wall (2022) – Novella Collection
This collection includes four novellas: The List, The Drop, The Catch, and a new story, The Last Dead Letter. These shorter tales offer additional insight into the Slough House world and are perfect for fans craving more.
13. The Secret Hours (2023) – Standalone Novel
While not strictly a Slough House novel, The Secret Hours is set in the same universe and explores MI5’s history through a gripping standalone story. It’s a great companion read that ties into the series’ broader mythology.
14. Untitled Slow Horses Book (Expected 2026)
As of September 2025, Mick Herron has hinted at a new Slow Horses novel, though no official title or release date has been confirmed. Stay tuned for updates on this highly anticipated addition!
Reading Tips for the Slow Horses Series
- Start with the novels: The main books (Slow Horses through Bad Actors) form the core of the series and should be read in order to follow the overarching plot and character development.
- Incorporate the novellas: While the novellas (The List, The Drop, The Catch, and Standing by the Wall) are shorter, they add valuable context and side stories. Read them in publication order for the best flow.
- Explore The Secret Hours: This standalone novel is optional but highly recommended for fans, as it connects to the Slough House universe.
- Watch the Apple TV+ series: The show adapts the first few books and is a great complement to the reading experience, though the books dive deeper into the characters and plots.
Where to Start Reading
If you’re new to the series, begin with Slow Horses to meet the team and understand their world. For fans of the Apple TV+ show, the books offer richer details and additional stories not covered in the adaptation. You can find the books at major retailers like Amazon, Barnes & Noble, or your local bookstore. Many are also available as e-books or audiobooks for convenience.
Why Slow Horses Is a Must-Read
The Slow Horses series is perfect for readers who love espionage thrillers with a twist. Mick Herron’s sharp writing, flawed yet relatable characters, and unpredictable plots make each book a page-turner. Whether you’re drawn to the intrigue of MI5, the dark humor, or the slow horses’ underdog spirit, this series has something for everyone.
Ready to dive into Slough House? Grab Slow Horses and start reading today! Have questions about the series or need help finding the books? Drop a comment below, and let’s discuss your favorite slow horse moments!
