Anna Fekete, who fled the Yugoslavian wars as a child, has a past. Just beginning her career as a criminal investigator in a northern Finnish coastal town, she is thrust into a high-profile, seemingly unsolvable case that has riveted the nation. It doesn't help that her middle-aged new partner, Esko, doesn't bother hiding his racist prejudices, and Anna becomes the target of a systematic campaign to unsettle her. A young woman has been killed on a running trail, and a pendant depicting an Aztec god has been found in her possession. Another murder soon follows. All signs point to a serial killer, but can Anna catch the Hummingbird before he--or she--strikes again? And at what personal cost?