Shetland series 10 wrapped up with a gripping finale, finally unmasking Eadie Tulloch’s killer and confirming the fate of much-loved Sgt Billy McCabe.
This season saw Calder and Tosh head to the remote hamlet of Lunniswick after the brutal murder of Eadie. Her body had been left exposed to the elements for days, and from the outset, the crime felt painfully personal.
As the investigation deepened, the murky world surrounding her family came into focus – from the corrupt dealings of her late husband Robert Tulloch to the criminal behaviour of her son Ed. Piece by piece, it became clear everything was connected.
In the final episode, the detectives uncovered the truth at last, securing justice for Eadie while also confronting the fallout from Billy’s earlier decision to hide crucial evidence. If you’re still piecing together exactly how it all came together, here’s your full guide to the ending of Shetland series 10.
***Warning: spoilers from the Shetland ending ahead***
Clive Russell as vengeful Arthur Mair in the Shetland series 10 ending (Credit: BBC One)
What happened in the Shetland series 10 ending?
The popular crime drama Shetland reached its dramatic conclusion this week (Wednesday, December 10, 2025). It saw the team race to “save one of their own”, as the truth about Eadie’s murder emerged and the pool of suspects began to narrow…
In the penultimate episode 5 of Shetland, viewers discovered that Ed Tulloch was working alongside the Callaghan crime gang. But this was all too little to late for DI Ruth Calder, who’d enjoyed a drunken one-night stand with him and found herself in possible danger.
The morning after the night before, Calder woke to several missed calls – and was horrified and embarrassed to discover that her brief fling was a wrong’un.
After interviewing Ed, Calder and Tosh were further blindsided by a shocking revelation about Lunniswick’s secret past that changed the course of their investigation – and led them straight to their killer…
Who killed Eadie Tulloch?
Arthur Mair murdered Eadie Tulloch as payback for her involvement in the death of his son Ally. Viewers knew that Arthur and Lana’s son Ally Mair died in a huge storm 20 years ago in Lunniswick. Eadie and Robert’s son Craig died in the infamous storm too. The official story was that the young men had died after going out the night before the storm on their fishing boat the Lintie. But that wasn’t the whole truth…
In fact, we discovered that Craig and Ally HAD returned before the storm hit. But corrupt police officer Robert – and in turn his wife Eadie – had sent them out again.
Eadie let this small detail slip decades later while being interviewed by neighbour Colin Waite. She admitted she had watched the Lintie sail away in daylight – not darkness as previously believed.
The revelation eventually led to her death, and she died facing the very spot where the Lintie sank. Robert was working alongside the drug trafficking family the Callaghan’s. And tragically, he’d got his own son Craig involved in the business. Even after his death, he’d got his other son Ed involved, too (more on that below).
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