In this latest puzzle, Inspector Erlendur learns of the baffling story of Matthildur, a local woman who went missing years earlier on the night of a violent storm. Erlendur has spent his whole life searching for his brother Beggi, who was lost in a snowstorm when they were both children. As he starts to ask questions about the fateful evening when Matthildur disappeared, Erlendur also begins to suspect what may have befallen his long-lost brother.
Can Erlendur possibly solve the disappearances of Matthildur and Beggi after all these decades? Or are the forces that want him to stop investigating stronger than he is?