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Publisher's Summary

The number one international best-selling 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.

©2021 Anders Roslund (P)2021 Penguin Audio

Critic Reviews

"If you thrill to the chills of Scandinavian noir, chances are you've read something by Anders Roslund...Roslund has two strong prose styles - dark and darker - and both are on show in this no-frills translation by Elizabeth Clark.” (New York Times Book Review)

“[H]eart-pounding.... This terrific mash-up of police procedural and crime thriller has strongly imagined characters, explosive action, and a twisty plot with an unexpected conclusion. It’s a must for Scandinavian noir fans.” (Publishers Weekly, starred review)

"Grens is an immensely compelling character whose sharp intuition and dedication to justice are reminiscent of Harry Bosch. This tense, sophisticated procedural can stand alone, but readers will find themselves drawn to Grens’ seven earlier investigations." (Booklist, starred review)

What listeners say about Knock Knock

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  • Overall
    5 out of 5 stars
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    5 out of 5 stars

Fantastic!!

I am a big fan of “Nordic Noir”. This was one of the best. You will be left wondering until the end.

5 people found this helpful

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Ridiculous!

Don’t waste your time. Absurd complicated plot that’s wholly unsatisfying in the end. Unsympathetic characters and crazy storyline.

2 people found this helpful

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Good book but not without issues.

This is a good book but did come with some issues. They're recording never failed to skip at the beginning of every chapter. The story is very compelling but clunky, but this might have been the translation. Simon Vance is excellent as always. Overall it's a good read but I think I would have enjoyed it better as a reed, rather than a listen.

1 person found this helpful

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A must scandi thriller..

Really enjoyed this, even though some parts were slooow, and didn't realize was book 4 in a series! But it did not seem to matter, will seek out Book 1!

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    3 out of 5 stars

Started out pretty good

By midway the wheels started falling off for me. The trust issues became ridiculous and the Rambo stuff became too much. If the main villains identity wasn’t so obvious, so early I would have been more keen on finishing.