Oslo, 2018. Former long-distance runner Sonja Nordstrøm never shows at the launch of her controversial autobiography, . When celebrity blogger Emma Ramm visits Nordstrøm’s home later that day, she finds the door unlocked and signs of a struggle inside. A bib with the number "one" has been pinned to the TV. Police officer Alexander Blix is appointed to head up the missing-persons investigation, but he still bears the emotional scars of a hostage situation 19 years earlier, when he killed the father of a five-year-old girl. Traces of Nordstrøm soon show up at different locations, but the appearance of the clues appear to be carefully calculated—evidence of a bigger picture that he’s just not seeing. Blix and Ramm soon join forces, determined to find and stop a merciless killer with a flare for the dramatic, and thirst for attention. The trouble is, he’s just got his first taste of it.