Missing persons particularly pique the interest of Reykjavík police inspector Erlendur, still haunted by the loss of his younger brother in a blizzard that he survived as a child. When the mysteriously draining Lake Kleifarvatn reveals a skeleton tied to an old Russian radio transmitter, Erlendur and colleagues Elinborg and Sigurdur Oli delve into the cold war era, when promising young Icelandic socialists were sent to Leipzig to study, and one of them lost the woman he loved in the atmosphere of "interactive surveillance." Considering himself a failure in family relationships, the introspective and dogged Erlendur is motivated to bring closure to a 70-year-old woman still waiting for her long-vanished lover; even a missing hubcap is a key to this case. Erlendur's developing relationship with a married woman, Elinborg's newfound success as a cookbook author, and Sigurdur Oli's phone calls from a troubled man add depth and texture to the fourth in Gold Dagger Award-winner Indridason's Nordic series (after Voices). This is exceptional fiction that transcends its genre.