There are 4 books in the The Cold Case Quartet series. The newest book is A Question of Guilt which came out in 2021.

1
The Katharina Code

By Jorn Lier Horst , Anne Bruce (translator) ,

Book cover of The Katharina Code: You loved Wallander, now meet Wisting.

** Jorn Lier Horst is the winner of the 2018 Nordic Noir Thriller of the Year award **

You loved Wallander, now meet Wisting . . .
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Twenty-four years ago Katharina Haugen went missing.

All she left behind was her husband Martin and a mysterious string of numbers scribbled…

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Book cover of The Cabin

'Horst is brilliant on the day-to-day details of investigation, while keeping tension to the end' SUNDAY TIMES

'Horst, a former Norwegian police detective, is often compared to Sweden's Henning Mankell for his moody, sweeping crime dramas' NEW YORK TIMES

If you loved Wallander, meet Wisting - your next Scandi crime…

3
The Inner Darkness

By Jorn Lier Horst , Anne Bruce (translator) ,

Book cover of The Inner Darkness

The chilling and heart-pounding new novel from Norwegian superstar Jorn Lier Horst.

THE INSPIRATION FOR THE HIT BBC FOUR SHOW WISTING

'Up there with the best of the Nordic crime writers' THE TIMES
'Tense, fast-paced, compelling' SUNDAY TIMES
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After four years behind bars, notorious serial killer Tom Kerr is…