The Absent One by Jussi Adler-Olsen
My rating: 4 of 5 stars
Having read the first Department Q book a short while earlier, it's fun filling in the spaces between then and the later books read longer ago. I'm not sure I completely followed all the action, but the developing relationships between Moerk, Assad and now Rose make much more sense now. As for the mystery itself, there's clearly something with Kimmie that never got identified and/or treated. Her life on the streets was fascinating, showing how some of the people we see are able to function at a relatively high level despite appearances. That she was willing to wait and play the long game was as interesting as her methods of revenge.
Can't wait to read Book 3.