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Shetland Series 10 Episode 6 brought the season to a dramatic close when it aired on December 10, 2025. After weeks of speculation, viewers finally learned who killed Eadie Tulloch, and the answer was buried in a decades-old tragedy.
Arthur Mair emerged as the killer, driven by revenge for his son's death. As the truth about the Lintie boat disaster came to light, meanwhile, Billy McCabe faced serious consequences.
The episode wrapped up multiple storylines while delivering emotional moments throughout. Ultimately, Shetland Series 10 Episode 6 gave fans the answers they had been waiting for, proving that some betrayals cannot be forgiven when justice arrives twenty years too late.
Ed Tulloch's arrest shocks Ruth in Shetland Series 10 Episode 6
The episode began with Ruth Calder waking up to missed calls and police arresting Ed Tulloch for drug trafficking. Lewis Mitchell had named Ed as the Callaghan accomplice, and the running bowline knot linked him to the operation.
However, Shetland Series 10 Episode 6 revealed that while Ed's arrest solved the drug mystery, it did not solve the murder. Tosh and Ruth knew they were missing something crucial.
Colin's video reveals the truth
The breakthrough came from Colin Waite's video project, which documented the village's history. During his interview, Eadie mentioned watching the Lintie sail away in daylight, which contradicted the official story.
Everyone believed the boys left the night before the storm, but Eadie's words proved otherwise. When Arthur saw the footage, he understood the horrifying truth. The boys had returned before the storm, and someone sent them back out. Shetland Series 10 Episode 6 showed Arthur confronting Eadie about what really happened that night.
The Lintie tragedy is exposed
The truth about the Lintie disaster was devastating. Craig Tulloch and Ally Mair came back before the storm struck, but Robert Tulloch was working with the Callaghans. A drug shipment was arriving that night, and the storm prevented the boat from getting close.
Robert instructed Eadie to send the boys back out to collect the drugs. Tragically, she obeyed and sent them into the raging storm where they died. For twenty years, the village mourned them as victims of nature. Shetland Series 10 Episode 6 revealed that Eadie sacrificed two young lives for money, and the loss of the Lintie was based on a terrible lie.
Arthur's revenge
When Arthur confronted Eadie, she knew he had discovered her secret. Eadie did not resist because she understood this was island justice. Arthur had lived with grief for two decades, and finding out his son had died because of Eadie's choice changed everything. Lana's dementia stemmed from losing Ally, and their family never recovered. Shetland Series 10 Episode 6 portrayed Arthur as a sympathetic killer who acted out of profound pain. The positioning of Eadie's body was significant as she died facing where the Lintie sank.
Billy turns himself in
Billy's storyline came to a conclusion as his past caught up with him. He had discovered heroin on the wrecked Lintie, and Robert promised to dispose of it while giving Billy ten thousand pounds as a loan. When Ray Powell was framed for the drug operation, Billy suspected foul play but stayed silent. Although Tosh chose not to report him, Billy called the police himself and confessed everything. Shetland Series 10 Episode 6 showed Billy taking full responsibility despite facing possible criminal charges and losing his job.
Tosh and Billy's farewell
The final scene between Tosh and Billy was deeply emotional. Billy apologized for letting her down after years of her idolizing him as the gold standard of policing. However, Tosh understood the difficult choices he faced two decades ago. Shetland Series 10 Episode 6 showed the complexity of his situation and refused to paint him as simply good or bad. Their friendship survived, but their professional relationship changed forever.
The village's secret burden
Lunniswick harbored a terrible secret for two decades that profoundly shaped the entire community. The Lintie tragedy became the defining moment in the village's history. Robert Tulloch corrupted the police force while Eadie enabled his criminal activities. Shetland Series 10, Episode 6, explored how lies can destroy communities from within. Arthur and Lana lost their son and never recovered, while the Callaghan drug operation continued for twenty years because of one terrible choice.
Ending Explained
Shetland Series 10 Episode 6 ended with Arthur Mair arrested for Eadie's murder after confessing without resistance. The detectives understood his motive as twenty years of grief drove him to kill. Eadie's complicity in sending two boys to their deaths sealed her fate. Arthur waited for decades for the truth to emerge, and Colin's video provided him with the evidence he needed. The ending showed that some betrayals cannot be forgiven. Billy's fate remained uncertain after confessing to the police, facing possible criminal charges, and career termination.
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Despite solving the case, Tosh and Ruth gained no satisfaction as the truth revealed only pain. The village of Lunniswick must now confront its dark history. Ed Tulloch faced drug trafficking charges while Ruth learned painful lessons about mixing work and romance. Shetland Series 10 Episode 6 proved that secrets always surface eventually, no matter how deeply buried.
Shetland Series 10 Episode 6 delivered a powerful finale that exposed decades of corruption and grief in Lunniswick.
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