Robertson returned to his home in Shetland to film the TV series of the same name, where he starred as Constable Sandy Wilson in the BBC One adaptation of the popular Ann Cleeves book series. The show was criticised for its lack of Shetland accents, with Robertson being the only main cast member born and brought up on the islands. However, the series attracted over 6 million viewers and a second series was commissioned featuring, alongside Douglas Henshall and Robertson, actors Brian Cox, Julie Graham and Alex Norton, with Robertson's character now as a detective. Robertson stated to Digital Spy that his portrayal of Constable Wilson was a "nice break from playing killers and creeps". A third series, telling a single story, aired in 2016.