Knock Knock

Knock Knock

by Anders Roslund

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Notes From Your Bookseller

The title of the book alone sets the mood at the start. A story is told. A knock is heard on a door. Inspector Ewert Grens arrives in the next chapter, and what he sees is not what was described. This book will set you on edge from the start. Be prepared for some serious breath holding.

The #1 international-bestselling thriller that tells the electrifying story of a police inspector and a former criminal informant in a race against time as they attempt to unravel past and present secrets.

He thought she was safe. Then the past came knocking.

Seventeen years ago, Criminal Inspector Ewert Grens was called to the scene of a brutal crime. A family had been murdered, and the only survivor--and witness--was the five-year-old daughter. The girl was placed in the witness protection program, and the case went cold, but years later, Grens is still haunted by the seemingly random slaying, and the little girl who was spared. So when he learns that the apartment where the crime occurred is now the scene of a mysterious break-in, Grens immediately fears that someone is intent on silencing the only witness. He races to find her...before they do.

Meanwhile, someone in the city's criminal underworld is executing weapons smugglers, and has placed former police informant Piet Hoffman's family in grave danger. He must unravel the secret threat to his family, all while keeping secrets of his own. Soon his hunt for answers intertwines with Ewert's, and the two men find themselves in the middle of a criminal conspiracy that is more complicated--and dangerous--than they could have imagined.

Product Details

ISBN-13: 9780593188224
Publisher: Penguin Publishing Group
Publication date: 01/19/2021
Sold by: Penguin Group
Format: NOOK Book
Pages: 448
Sales rank: 8,409
File size: 5 MB

About the Author

Anders Roslund has published ten novels as part of the successful writing duos Roslund & Hellström and Roslund & Thunberg. His books have been published in thirty languages and he is the recipient of numerous prestigious international awards. Knock Knock is his first solo novel.

Read an Excerpt

I’m five years old.

Almost exactly.

I know that. Five years and a few days and a few nights.

It still feels like it just happened. I was sitting at the kitchen table with Mom on one side and Dad on the other and Eliot and Julia were across from me. And I blew out five candles all at once. They were in the middle of my cake and they were red with a little blue too but only at the very, very bottom, when you looked really close.

A few days and a few nights.

I clear my throat and try to smile, like I always do when I sing. It’s my favorite song. Happybirthdaytoyooou. And if I sing it loud enough, my voice bounces off the ceiling and the walls and comes back to my open arms, where I catch it and hold on tight.

Happybirthdaytoyooou. Happybirthdaytoyooou.

When I sing, I don’t hear the TV. A kid’s show. I’ve been watching it almost all day. Just like yesterday. And the yesterday before that. I didn’t get to do that before. But I do now.

I stop singing, stand up; it’s hard to stay on the floor when my legs want to move, which they do a lot. I hop out of our living room, which is so big. I have to be careful here, the sofa is almost brand new, and the table is made of glass. If I touch it, my fingers leave smudges.

I jump all the way to Eliot’s room, where he’s sitting at his desk chair with his desk lamp on. He’s pretending to read with a book open in front of him. But he can read, I know it, he’s in second grade now. Eliot’s gotten nicer the last few days. Probably because I turned five. I’m not four anymore, I’m big now. He doesn’t even push me away from his racetrack anymore, the one he keeps high up on a shelf so I can’t reach it. And he even let me win twice with the blue car that has a yellow line on its roof. He never did that before.

I always jump on one leg. Just one leg at a time. And if I use two, I go back and do it all over again. I came up with that myself.

Julia has a dollhouse in her room. It’s really old. And I’m not allowed to touch it. If I do, Julia runs straight into my room and grabs my dollhouse and shakes it hard. But my big sister is asleep. She’s on her tummy and her face is turned away. Julia can’t see that I moved the tiny furniture, which is supposed to be on the top floor, down to the bottom floor.

In here I can’t hop. Then she’ll see me. I have to sneak. If Julia wakes up, if she sees me by the dollhouse she’ll scream, and maybe even jerk on my arm.

Mom is sitting on a chair in the kitchen, laughing a little. You can’t hear it, but she’s smiling while she watches my ­five-​­year-​­old hopping feet. She’s been happy for a while now, and it’s so nice when Mom laughs, it doesn’t matter if it dribbles onto the floor a little when you drink orange juice straight out of the carton, or if you drop a little sugar and flour on the kitchen table because you’re baking. I grab onto the edge of the table and pull myself up into Mom’s lap. It’s always so easy to talk to her. I like to put my ear to her tummy and listen to how her voice sounds deep down inside before it comes out.

After I sit on Mom’s lap I like to hop on one leg out to the creaky wicker chair in the hallway, to Dad. He likes to sit there, he reads a lot of newspapers, and it’s a little quieter out there with the jackets and the umbrellas. I listen. Yes, it is, it is quieter. And the chair is so big, almost like an armchair. I’m able to squeeze in next to him. I think he likes when I sit there. Then he can still use his arms to flip the pages of his big, rustling newspapers.

Eliot and Julia and Mama and Papa. I think I like them even more than before. I can talk as much as I want. And they listen.

It’s fun to turn five.

And then keep celebrating it for a few more days and nights.

I sing it again. Happybirthdaytoyooou. Happybirthdaytoyooou. I sing it loud, really loud, trying to sing over the knocking on the door. Then more knocking, harder this time. Finally I stop singing, and hop down from Dad’s chair, and run super fast. I stand on my tippy-toes and jump as high as I can. I’m just able to grab on and turn the tiny bar.

Mom taught me how. I am always supposed to lock the door behind me. The shiny bar should be turned to look like a mouth and not a nose.

And that’s the one I’m trying to turn right now.

A beautiful door.

Dark, heavy wood, early twentieth century. It somehow belongs with the muted, hollow sound of his knocking that fills the rounded stairwell, echoing off the slightly too steep steps, the high and elegant ceiling, and the flowery wallpaper that grows more lushly realistic on every floor. Ewert Grens, standing in front of an apartment in central Stockholm, knocks again even harder.

“Somebody’s in there. I hear them all day long. I hear it through my living room floor, in my hall, even in the bathroom. You wouldn’t believe how thin the walls are in this building.”

A voice, pinched and irritated, comes from behind him. Grens doesn’t turn around, doesn’t answer, just rings the bell for a fourth time.

“Someone’s ­singing—​­probably one of the kids, I’m fairly certain they have three. And I think it might be a TV too, very loud. It’s been on for at least a couple of days. And not during the ­day—​­all night, too. I was the one who called, I live in the apartment upstairs.”

The detective superintendent finally glances behind him. A man, just over forty, arms crossed, the kind of guy he dislikes immediately without really knowing why. The type who puts their ear to the door and listens.

“Happy birthday.”


“That’s the song the child sings. Happy birthday to you. Over and over.”

The neighbor called in about the strange sounds. And called again when strange sounds turned to strange smells.

“I’m going to have to ask you to return to your own apartment now.”

“But I’m the one ­who . . .”

“Yes—​­and you did the right thing. But now I need you to go back upstairs so I can take care of this.”

Grens waits until he’s completely alone before knocking a third time, impatiently, urgently, as if the muted and the hollow are calling out decisively. When no one opens the door, he bends down to peek through the mail slot, but before he gets there, someone on the other side tries to turn the lock. They don’t manage, but they try again. He can hear a quiet thump on a hardwood floor.


Thump, thump, like someone jumping.

“Police. Open the door.”

A lock that is slowly being turned. A handle that seems to move on its own.

Ewert Grens doesn’t like using a weapon. But still he grabs the gun from his shoulder holster and takes a step back.

Her hair is quite long. Blond. He doesn’t know anything about children, but if he had to ­guess—​­she’s four, maybe five years old.


She’s wearing a red dress. Big stains on its chest and stomach. She smiles, her face is also stained, maybe from food.

“Hello. Are your mom or dad at home?”

She nods.

“Good. Can you go get them?”



“They can’t walk.”

So strange.

How the stench, sharp, intrusive, a stench he’s so familiar with, which met him faintly as soon as he entered the beautiful stairwell and assaulted him anew the moment the child with stains on her dress and her face opened the ­door—​­how that stench doesn’t really become part of his consciousness until he takes a few steps into the hall and is standing in front of a man slumped over in a chair between a coat and a shoe rack.

“This is my dad.”

A large hole sits on the right side of his forehead. Shot at close range from the front, probably a handgun and a ­soft-​­point bullet, half lead, half titanium.

“I told you.”

The other bullet hole is slightly smaller, shot from an angle, just below the left temple.

“See they can’t walk.”

Ewert Grens doesn’t have time to stop her from jumping into her father’s lap, arranging his stiff, unwilling hands so that they’re not in her way, squeezing in between his right thigh and the chair’s armrest.

“Come here.”

“I’m going to talk to Daddy.”

“Come to me.”

Grens has never held a child of that age, and they’re heavier than he imagined. He grabs hold of her shoulders, then lifts her gently.

“Are there more?”


“Is it just you and Daddy?”

“Everybody’s here.”

Her mother is sitting in a chair in the kitchen. She seems to have her eyes shut, lips frozen in a smile. Two bullet holes, just like the ­father—​­forehead and temple. There’s sugar and flour on the table, her clothes, and the floor. It doesn’t want to let go of the soles of his shoes as he walks across it. Mostly Grens stares at the cake, which sits untouched on the large kitchen table, five extinguished candles, green marzipan.

“It’s mine. My birthday cake.”

“It looks delicious.”

“I blew the candles out myself.”

The two siblings are exactly where the girl says they’ve been for a long time. In their rooms, the sister lying on the bed, bullet hole in the back of her head, the brother at his desk, shot straight from above, bullet hole on the crown of his head.

That terrible sound. A TV, at maximum volume, a kid’s show. Ewert Grens turns it off.

The quiet living room feels emptier.

Too much space for a stench more intense than any he’s experienced before.

He sits down on the black leather sofa, as glossy as it is long, puts the girl in one of the armchairs. He looks at her for a long time. She doesn’t seem scared, just hums quietly to herself.

“You have a pretty voice.”


“Very nice. You just had your birthday?”


“Five? Like the candles on the cake?”

“And a few days.”

“A few days?”

“And a few nights.”

Ewert Grens looks around, struggling to keep breathing, slow and steady.

A few days and a few nights.

That’s how long this little girl has lived with the stench.




He’s never liked summer.

Something that chafed at his skin, something he’d fought year after year until finally he stopped fighting it at all. That’s the way it is. The heat. The quiet city. People walking around in shorts, laughing too loud.

Detective Superintendent Ewert Grens lay on the brown corduroy sofa, its stripes long since worn away, his head cradled on the low armrest, his back sunk into cushions that had been far too soft for a long time. While that gentle music, his Siw Malmkvist who sang sixties songs just for him, flowed out of an ancient speaker crammed into his bookshelf between overflowing binders and thick investigation reports. Both of his windows stood wide open, but despite the early hour it was already a stiflingly warm ­twenty-​­seven degrees inside and out. He’d stopped fighting when he realized he was not alone. He wasn’t the only one who was changed by June, July, and August. But they didn’t fight the ­season—​­they fought people. That terrible heat crept into them, hunted them, played havoc with their boundaries, and it wasn’t just in prison corridors that the number of riots increased as the heat became more oppressive; also outside those walls reality shrank as heat pushed down from above. And when heart rates increase, so does violence, so does murder. He’d been a detective for most of his life, and it had been a long time since he could take a break when the sidewalks lacked any snow.

A stubborn knocking at his office door.

They could keep on if they wanted to.

His neck was stiff and tender, his leg aching like usual. The oldest detective on this dusty corridor, second oldest on the entire force. And there it was, less than six months away, that giant black hole that scared him even more than his bed at home, an abyss a man falls into headlong and then never stops falling. The one thing he didn’t want to think about, and the only thing he could think about.

That goddamn knocking. They weren’t giving up.

More than forty years. My god. He’d been so young when he first set foot in this building, already convinced he belonged here. So young he could never imagine the end arriving. Not because you want it, but because a society you never wanted to be a part of has decided the ending for you.


Now it wasn’t enough to just knock. Now someone was shouting through the keyhole.

“I know you’re in there, Ewert. I’m coming in. No matter what you say.”

He was still lying on the worn corduroy sofa when the door opened. She glanced at him, then strode purposefully over to the cassette player and its off button. Siw fell silent. The songs of a much simpler time.

Mariana Hermansson.

Perhaps the only person in the Kronoberg Police Station whom he couldn’t bend to his will, who always challenged him, and who had no clue how proud she made her boss when she did.

“Breaking and entering, Ewert.”

Her office was at the far end of this hall. She’d started as a temp one summer, and he made sure she got hired ­full-​­time despite the bureaucracy and the many applicants who seemed more qualified on paper. And he’d come to treasure her like the daughter he never had, how she’d put a steady hand on his arm when she spoke to him, how she demanded answers to questions he didn’t even want to hear, how she laughed at him, made him feel unsure of himself in the only context where he ever felt sure.

“I want you to take a look at it. Now.”

He sat up on the edge of the sofa, stretching a little, and pointed to his desk and its mountains of paperwork.

“I don’t work ­break-​­ins. Too many people dying in this town. And that, as you very well know, takes all of my time.”

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