Scandi-noir fans are in for a treat. <i>Knock Knock</i> is <b>a dark read - not for the lily-livered.</b>
The Herald
A <b>masterpiece </b>of a thriller. Brutal, gripping, intelligent. It left me breathless.
Liza Marklund
A tense and detailed thriller...The ending is <b>a twist and a shocker</b>.
New York Journal of Books
[Grens is] an eccentric, alienated, socially inept hero <b>worthy of comparison with Swedish mystery master Henning Mankell's Inspector Kurt Wallander</b>.
Wall Street Journal
A perfect example of Scandi noir
The Times