Who Killed Nanna Birk Larsen? Head of investigations, Sarah Lund, is about to emigrate to Sweden, but as the tied-up body of a missing girl is found her plans are put on hold. In the course of 20 gripping episodes, each chronicling a day in the investigation, Copenhagen's secrets, corruption and power struggles emerge as the hunt for the killer intensifies and the truth becomes ever harder to find. This riveting Emmy-nominated thriller is one of the finest murder investigation series ever produced.