Shetland: Dead Water (Part 1 of 2)

Part one of two. A journalist dies in a suspicious car accident, and when it turns out he was an old friend of Perez, a forensic scientist is called in to ensure an objective view of the case. As the team awaits her results, they look into the reasons for the victim's return to the island, and find he was chasing a lead about plans for a controversial new gas pipeline. Was this the story that cost him his life? Douglas Henshall and Julie Graham star, with David Hayman, Nina Sosanya and Alex Norton