Not far from the small Norwegian town of Trumsø, on a deserted island with a lighthouse, a young man named Rasmus disappears without a trace. His parents seek help from former police interrogation specialist Torkild Aske, asking them to find their son. Thorkild was recently released from prison, where he spent three years for manslaughter. He is dependent on drugs, and is far from in the best condition. With great reluctance, Torkild goes to the lighthouse.