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Reviews

  • Scandi-noir fans are in for a treat. Knock Knock is a dark read - not for the lily-livered.

    The Herald
  • A masterpiece of a thriller. Brutal, gripping, intelligent. It left me breathless.

    Liza Marklund
  • A tense and detailed thriller...The ending is a twist and a shocker.

    New York Journal of Books
  • [Grens is] an eccentric, alienated, socially inept hero worthy of comparison with Swedish mystery master Henning Mankell's Inspector Kurt Wallander.

    Wall Street Journal
  • A perfect example of Scandi noir

    The Times

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