Investigator Sofia Kovic has uncovered a connection between several deaths in Oslo over the last year and a half. She tries to call her superior, Alexander Blix, but before Blix has time to return her call, Kovic is shot and killed in her own home. In the apartment below, Blix's daughter Iselin narrowly escapes becoming the killer's next victim. Four days later, Blix and online crime journalist Emma Ramm are locked inside an interrogation room, facing...