Outrage by Arnaldur Indridason

Detective Erlendur is away on vacation and his colleague Elinborg is assigned to investigate the murder of Runolfur, a young man found with a large amount of Rohypnol (a "date rape drug") in his system. A woman's shawl is also discovered under his bed--it appears that he's probably been drugging and raping women. With that in mind, did one of his victims get revenge? Might someone else have had a problem with him? In Outrage, Elinborg's personal life is explored (mainly her strained relationship with her teenage son, Valthor). With Erlendur being the main character of the series, it was nice to see Elinborg more developed. On the other hand, I missed Erlendur's tortured soul.