Selling more than four million copies worldwide, Mick Herron’s iconic series has achieved astounding mainstream success. A collection of spy novels, the story centers around a group of M15 agents who have each somehow been disgraced and, as such, are sentenced to the drab Slough House. The Diamond Dagger award winner offers a grittier take on espionage, with the “slow horses,” a diverse and flawed bunch, who are working hard to redeem themselves.
In 2022, the first novel, Slow Horses, was adapted into an Apple TV+ television series of the same name. With Gary Oldman in the lead role as Jackson Lamb, heading the unit, the other cast of fallen agents includes Jack Lowden, Kristin Scott Thomas, and more. Since then, four more seasons of the show have been released, each adapted from the subsequent novels in the series, with a sixth season in the works.
Now, Herron is back with a ninth installment in the hit series, Clown Town, where this time, Jackson Lamb and his team at Slough House are looped into a battle between M15’s murky past and its threatening future. David Cartwright, former head of the M15, left his library to his grandson, River Cartwright, who was once a “slow horse,” and has begun digging into the secrets hidden in the old books—only to discover information is missing.
Meanwhile, the agents at the Slough House, who have never been good at following instructions, continue to wreak havoc. An M15 operation that took place during the Troubles is about to expose an ugly side of state security, one that would be better kept buried. M15 First Desk Diana Taverner, despite being advised to stay clear of the scheme, is about to stir things up—and this time, she might not make it back.
Ahead of the September release of the ninth installment, Clown Town, Murder & Mayhem is proud to partner with Soho Crime to give away all eight previous entries in the Slough House series!
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About the Slough House series
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Slow Horses
London, England: Slough House is where washed-up MI5 spies go to while away what’s left of their failed careers. The “slow horses,” as they’re called, have all disgraced themselves in some way to get relegated there. Maybe they botched an Op so badly they can’t be trusted anymore. Maybe they just got too dependent on the bottle—not unusual in this line of work. One thing they have in common, though, is that they want to be back in the action. And most of them would do anything to get there—even if it means having to collaborate with one another.
When a young man is abducted and his kidnappers threaten to broadcast his beheading live on the Internet, the slow horses see an opportunity to redeem themselves. But is the victim really who he appears to be?
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Dead Lions
The slow horses have a chance at redemption. An old Cold War-era spy is found dead on a bus outside Oxford, far from his usual haunts. The despicable, irascible Jackson Lamb is convinced Dickie Bow was murdered.
As the agents dig into their fallen comrade's circumstances, they uncover a shadowy tangle of ancient Cold War secrets that seem to lead back to a man named Alexander Popov, who is either a Soviet bogeyman or the most dangerous man in the world. How many more people will have to die to keep those secrets buried?
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Real Tigers
Catherine Standish, one of the “slow horses,” worked in Regent’s Park long enough to understand treachery, double-dealing, and stabbing in the back, and she’s known Jackson Lamb long enough to have learned that old sins cast long shadows. And she also knows that chance encounters never happen to spooks, even recovering drunks whose careers have crashed and burned.
What she doesn’t know is why anyone would target her. So whoever’s holding her hostage, it can’t be personal. It must be about Slough House. Most likely, it’s about Jackson Lamb. And say what you like about Lamb, he’ll never leave a joe in the lurch.
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Spook Street
David Cartwright isn't a modern spy, however; he's a legend and a bona fide Cold War hero. He's also in his dotage and losing his mind to Alzheimer's. Cartwright may be losing track of reality, but he's certain about one thing: Old spooks don't go quietly, and neither do the secrets they keep.
Does the Service have a retirement home for those who know too many secrets but don't remember they're secrets? These are the questions River Cartwright must ask when his grandfather starts to suspect everyone in his life has been sent by the Home Office to watch him. But River has other things to worry about. A bomb has detonated in the middle of a busy shopping center, and the agents of Slough House must identify who is behind this act of terror before the situation escalates.
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London Rules
London Rules might not be written down, but everyone knows rule one: Cover your arse. At MI5 headquarters in Regent's Park, First Desk Claude Whelan is learning this the hard way. Tasked with protecting a beleaguered prime minister, he's facing attack from all directions himself: from the showboating MP who orchestrated the Brexit vote; from the PM's favorite elect, who's about to become mayor of the West Midlands, despite the dark secret he's hiding; and especially from his own deputy, Lady Di Taverner, who's alert for Claude's every stumble. Meanwhile, the country is being rocked by an apparently random string of terror attacks.
Over at Slough House, the agents are struggling with personal problems. Plus, someone is trying to kill Roddy Ho. But collectively, they're about to rediscover their greatest strength—that of making a bad situation much, much worse.
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Joe Country
In Slough House, the London outpost for disgraced MI5 spies, memories are stirring, all of them bad. Catherine Standish is buying booze again, Louisa Guy is raking over the ashes of lost love, and new recruit Lech Wicinski, whose sins make him an outcast even among the slow horses, is determined to discover who destroyed his career, even if he tears his life apart in the process.
Meanwhile, in Regent’s Park, Diana Taverner’s tenure as First Desk is running into difficulties. If she’s going to make the Service fit for purpose, she might have to make deals with a familiar old devil . And with winter taking its grip, Jackson Lamb would sooner be left brooding in peace, but even he can’t ignore the dried blood on his carpets. So when the man responsible for killing a slow horse breaks cover at last, Lamb sends the slow horses out to even the score.
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Slough House
A year after a calamitous blunder by the Russian secret service left a British citizen dead from Novichok poisoning, Diana Taverner is on the warpath. What seems a gutless response from the government has pushed the Service's First Desk into mounting her own counter-offensive—but she's had to make a deal with the devil first. And given that the devil in question is arch-manipulator Peter Judd, she could be about to lose control of everything she's fought for.
Meanwhile, still reeling from recent losses, the slow horses are worried they've been pushed further into the cold. Slough House has been wiped from the Service records, and fatal accidents keep happening. With a new populist movement taking a grip on London's streets, and the old order ensuring that everything's for sale to the highest bidder, the world's an uncomfortable place for those deemed surplus to requirements. But the slow horses aren't famed for making wise decisions. And with enemies on all sides, not even Jackson Lamb can keep his crew from harm.

Bad Actors
A governmental think-tank, whose remit is to curb the independence of the intelligence service, has lost one of its key members, and Claude Whelan—one-time head of MI5's Regent’s Park—is tasked with tracking her down. But the trail leads straight back to the Park itself, with Diana Taverner as chief suspect. Has Diana overplayed her hand at last? And does Jackson Lamb know more than he’s telling?
Over at Slough House, with Shirley Dander in rehab, Roddy Ho in dress rehearsal, and new recruit Ashley Khan turning up the heat, the slow horses are doing what they do best, and adding a little bit of chaos to an already unstable situation. There are bad actors everywhere, and they usually get their comeuppance before the credits roll. But politics is a dirty business, and in a world where lying, cheating, and backstabbing are the norm, sometimes the good guys can find themselves outgunned.
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Featured image: Soho Crime