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  • The Sleepwalker

The Sleepwalker

Killer Instinct #10 / 10
by Lars Kepler
The Sleepwalker (Killer Instinct #10) by Lars Kepler
⧗ 9.58 / 12
12345672819910

An emergency call comes in the middle of the night. There is an ongoing burglary at a closed campsite in Bredäng, outside Stockholm. When the police respond to the call, there is a light on in one of the farthest caravans in the otherwise dark area, where the officers are greeted by a horrific sight. The floors, walls, and furniture are completely covered in blood. A person has been killed with an axe and brutally dismembered. In one of the rooms, a young man is sleeping on the floor with a severed arm as his pillow. He is arrested and taken into custody at Kronobergshäktet. There, he is identified as seventeen-year-old Hugo Sand, the son of a famous author.

It turns out that Hugo is suffering from a rare kind of somnambulism, which is triggered by nightmares. He is either the perpetrator or a witness but claims that he remembers nothing from that night.

When Joona Linna is asked to take on the case, he contacts his old friend Erik Marie Bark to use hypnosis in the quest to find out what happened inside the caravan. This is the start of a complicated hunt for a terrifying killer who has just entered an extremely active phase.

Also known as Joona Linna Book 10.
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ThrillerMysteryCrime FictionTranslationNordic Noir
Release date: July 31, 2025

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Joona Linna book 10
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Lars Kepler

Lars Kepler

Lars Kepler is the pseudonym of the Swedish writing duo Alexander and Alexandra Ahndoril, a pair whose collaborative genius has redefined Scandinavian crime fiction. Under this name, they've created one of the most thrilling and suspenseful series in modern crime literature, centered around Detective Joona Linna. Their stories are known for their relentless pace, intricate plots, and a chilling exploration of human nature’s darkest corners.

The couple began writing together after their shared passion for crime novels led them to merge their individual talents—Alexandra’s keen psychological insights and Alexander’s experience in writing thrillers. Their first book, The Hypnotist, immediately captured the attention of readers and critics alike, launching the Joona Linna series into the international spotlight. Since then, the duo has continued to captivate audiences with their ability to craft complex characters, nail-biting suspense, and twists that leave readers breathless.

Read more ...

At the core of Kepler’s writing is an almost cinematic ability to build tension, taking readers on a journey through the underbelly of society with each new case. Their works blend the visceral impact of classic thrillers with psychological depth, creating stories that aren’t just about solving crimes, but about the dark, twisting forces of the human psyche.

Though Lars Kepler’s books have been translated into numerous languages and sold millions of copies worldwide, their writing remains a deeply personal process. They often draw from their experiences in Sweden, with its stark, sometimes unforgiving landscapes, as well as from the complex and often morally ambiguous characters that populate their stories.

Whether exploring the twisted motivations of killers or the fragile nature of the mind, Lars Kepler’s novels are not just mysteries to be solved—they’re dark explorations of what happens when the human mind reaches its breaking point. In their hands, the crime thriller genre is pushed to its limits, always leaving readers hungry for more.

Killer Instinct

Also known as Joona Linna.

In the shadowy corners of Stockholm, a new breed of killer emerges—a chilling figure whose every move seems calculated and every murder meticulously planned. Killer Instinct is a pulse-pounding crime thriller series that dives deep into the minds of both hunters and prey, where nothing is as it seems, and every twist is designed to leave you breathless.

Read more ...

At the heart of the series is Joona Linna, a detective with an unshakable drive to uncover the truth, no matter the personal cost. As he faces increasingly complex and brutal cases, the line between justice and obsession begins to blur. Each book in the series plunges readers into a labyrinth of psychological tension, where intricate crimes are only part of the story. The real challenge lies in understanding the forces that drive these killers, the primal instincts that reveal themselves in the most terrifying ways.

What sets Killer Instinct apart is its blend of suspense, psychological depth, and relentless pacing. Lars Kepler weaves a world that feels as gritty and raw as the crimes it portrays. From the chilling atmospheres of the Swedish cityscapes to the complex, morally ambiguous characters, every page is an invitation to unravel a deeper mystery. The series is as much about the dark corners of the human mind as it is about solving murder cases.

As the stakes rise and the tension intensifies, Killer Instinct challenges readers to confront the darkest aspects of human nature. With each book, the questions become more urgent: Who is the real monster, and how far are we willing to go to stop them?

For fans of psychological thrillers, Killer Instinct offers a masterclass in suspense and storytelling, where the hunt for a killer is just the beginning of the chilling journey. Every page turn uncovers a new layer, leaving readers eagerly awaiting the next twist in this unforgettable series.


Killer Instinct consists of ten books. The current recommended reading order for the series is provided below.

The Hypnotist (Killer Instinct #1)
Unrated
The Nightmare (Killer Instinct #2)
Unrated
The Fire Witness (Killer Instinct #3)
Unrated
The Sandman (Killer Instinct #4)
Unrated
Stalker (Killer Instinct #5)
Unrated
The Rabbit Hunter (Killer Instinct #6)
Unrated
Lazarus (Killer Instinct #7)
Unrated
The Mirror Man (Killer Instinct #8)
Unrated
The Spider (Killer Instinct #9)
⧗ 8.12 / 17
The Sleepwalker (Killer Instinct #10)
⧗ 9.58 / 12


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