Perez and Tosh are warned to stay away from Mathias Soderland by the Norwegian Secret Service, who tell them they're meddling in an operation they don't understand. With Soderland their prime suspect for Sally McColl's murder, Perez and Tosh won't be bullied. However, their investigation is suddenly derailed by a shocking discovery.
When a young archaeologist discovers a set of human remains, the Shetland community is intrigued to know if it's an ancient find or a contemporary mystery. And when an elderly woman is shot on her land in a tragic accident, Perez and his team find themselves at the centre of two feuding families whose envy, greed and bitterness has divided the surrounding community.
Shetland - Series 4, Episode 4 Synopsis and Schedule