The girl by the bridge

The young woman disappeared without a trace. Her desperate grandparents turn to retired Commissioner Konráð, whom they know from before. They know the granddaughter was smuggling drugs. She's missing now. Konráð has put an end to his professional past and is mainly concerned with a matter from his own family history. But when his search turns up a little girl who drowned decades ago in Reykjavík's small lake Tjörnin, he decides to find out the truth at any cost. Was the girl's death really just a tragic accident? And there's a connection to the young woman's disappearance?