Hypothermia by Arnaldur Indridason

Even after the police close the case and label her friend Maria's death a suicide, Karen isn't convinced. She discusses her feelings with police detective Erlendur and he decides to conduct his own "unofficial" investigation. Yes, Maria was depressed after her mother's recent death and the trauma of her father's drowning when she was young, but Erlendur wonders if she was pushed to kill herself. Erlendur is also troubled by a trio of missing persons cases from over thirty years ago. In three separate incidents, three young people disappeared and were never seen again. After the father of one of the missing men comes and sees him, he spends some time trying to close those cases, too. Since all of Erlendur's inquires are conducted in secret, the story focuses on him, only occasionally mentioning his co-workers Sigurdur Oli and Elinborg, who have been featured in previous books in the series. Despite this fact, I really enjoyed the latest book in this Icelandic mystery series. It will be published in the United States this fall.