The Girl by the Bridge - Arnaldur Indridason

Over 18 million copies sold worldwide. The bestselling Icelandic author of all time. When a young woman known for drug smuggling goes missing, her elderly grandparents have no choice but to call the retired Detective Konrád. Still looking for his own father's murderer, Konrád agrees to investigate the case. But digging into the past reveals more than he set out to discover, and a strange connection to a little girl who drowned in the Reykjavík city pond decades ago recaptures everyone's attention. A brilliant, chilling tale of broken dreams and children who have nowhere to turn.