I pounced on this book because I loved the previous book, The Keeper of Lost Causes (alternate title Mercy), featuring Carl Mørck, head of department Q. To get full enjoyment out of this book, I'd suggest reading the earlier book first, where Carl's irascible, anti-social personality and personal troubles are introduced. Carl is such a difficult employee that the Homicide chief has given him his own department and stuck him in the basement, with a load of dead-end cases no one has been able to solve. Carl solved one such lost cause in the previous book.
This book begins with a case file that appears inexplicably on Carl's desk. Strangely, it's a closed case, with a conviction already in place. Two siblings were murdered, and a student at a prestigious boarding school confessed. So why should Carl bother with it? But he gets intrigued and discovers that the supposed killer was part of a rich kids' gang. The more he digs, the more he suspects the whole gang. But by now they've made their own millions and are roaming the upper echelons of Danish society.
No one wants Carl Mørck going after these financial demigods.
We know who the villains are, so the plot evolves around Carl's attempts to get evidence against them. In the background is a dangerous woman who used to be part of the gang and is now out to get them. Kimmie is a fascinating creature, part villainess, part victim; a rich girl turned bag lady.
I found the criminals and their doings a bit unbelievable, but I enjoyed the book anyway. I loved Carl's oddball team (a mysterious Muslim and a fierce feminist). And I was amused by Carl's lustful attraction to the woman shrink who's assigned to fix his personality disorders.
I definitely recommend Jussi Adler-Olsen's Department Q mysteries, especially to fans of Scandinavian Noir.