Shetland Season 10 Episode 6 (finale) will air on BBC One on December 10 at 9 p.m.The latest season of this hauntingly beautiful British detective series follows DI Alison "Tosh" McIntosh and DI Ruth Calder as they travel to the remote village of Lunniswick to investigate the brutal murder of Eadie Tulloch, an elderly widow of one of Billy's colleagues.Elsewhere, Ruth is self-employed on a personal mission to bust a large dr*g ring in Shetland, which is responsible for her young informer Will Louden's recent overdose.Shetland Season 10 marks the return of Alison O'Donnell as Tosh and Ashley Jensen as Ruth, along with Steven Robertson as DC Sandy and Lewis Howden as Billy McCabe. The new additions in the current season include Greg McHugh, Stuart Townsend, Clive Russell and Ellie Haddington.More on this in our story.Shetland Season 10 Episode 6 Release date and streaming detailsThe sixth episode (finale) in Shetland Season 10 will air on BBC One on December 10 at 9 p.m. Like previous seasons, the tenth season of this popular British crime series aired weekly episodes (every Wednesday) on BBC One. The upcoming chapter will likely close the harrowing murder mystery of Eadie Tulloch's death.The finale will simultaneously drop on BBC iPlayer. You can also tune into all old and new episodes of this haunting crime drama on the platform.Here's when the Shetland Season 10 finale will drop around the globe:UK (GMT)- December 10 at 9:00 p.m.US (EST)- December 10 at 4:00 p.m.Europe (CET)- December 10 at 10:00 p.m.India (IST)- December 11 at 2:30 a.mAustralia (AEST)- December 11 at 8:00 a.m.Billy made a shocking confession in Shetland Season 10 Episode 5 View this post on Instagram Instagram PostTosh's investigation into Eadie Tulloch's murder saw a shocking new turn when she discovered a missing bank statement for an outgoing payment of 10,000 pounds made in May 2001 from Robert's account to Billy. While Billy claimed that the money was a loan for his home, Tosh suspected him and ordered him to stay away from the investigation.In the final moments of Shetland Season 10 Episode 5, Billy finally came clean to Tosh and revealed a dark truth about his past with Robert, twenty years ago. Billy confessed how he and Robert discovered a washed-up boat filled with tons of heroin while they were searching for Craig and Ally. Since the village was already mourning, Robert did not make this matter public and promised Billy that he would get rid of the dr*gs. However, Billy suspected Robert of foul play when Ray Powell confessed out of the blue and he feels guilty of unknowingly starting a dr*g ring in Shetland.Elsewhere, Sandy got his hands on Lewis Mitchell, the last person who called Will before his overdose. The episode concluded as Lewis promised to expose the mastermind behind the dr*g ring in front of Sandy.What can you expect from the Shetland Season 10 finale?The official synopsis for Episode 10 reads as follows:As Calder and Tosh get closer to understanding why Eadie was killed, fewer suspects remain.The closing chapter in the Lunniswick mystery will finally give answers about Eadie's murder. After Billy's shocking confession, it would be interesting to see how Tosh will deal with the aftermath and close in on the killer.As Calder and Tosh narrow in on the truth behind Eadie’s murder, the story will tighten into an intense and character-driven mystery where every remaining suspect matters. Expect the narrative to shift into a sharper gear where small clues suddenly feel significant and previously overlooked details snap into focus.Tune in to the Shetland Season 10 finale on BBC One on December 10.For the latest scoops on your favorite TV shows and movies, follow SoapCentral.