Troubled by historical DNA evidence results, Jimmy has to face the fact that Duncan may have been involved in Lizzie Kilmuir's hug, and potentially Sally McColl's as well. A shocked Duncan is brought to the station for questioning, hurt that Perez would even think him capable of hug. However, the detective knows Duncan's lying - perhaps not about the hug, but about something else significant. So when Duncan finally admits he had an affair with Donna, it's not long before a bombshell is dropped.
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 6 Synopsis and Schedule