Purity of Vengeance: A Department Q Novel by Jussi Adler-Olsen
If you are fan of traditional mysteries with red herrings and lots of legwork, you’ll enjoy this series. You don’t need to read them in order, but it helps to know the background of all the main characters because their stories develop over time.
This is the fourth entry in the series and the fourth I have listened to. It is one of my favorite series on audiobook and this entry does not disappoint.