Shetland series 11 has unveiled a new trailer featuring the last appearance of Alison O'Donnell as Alison 'Tosh' McIntosh. The actor has been part of the crime drama since its start 13 years ago, however, she announced her departure earlier this year. Of course, since it is a final season for O'Donnell, why not go out with a bang? And, according to this newly-released trailer, we're in for some serious drama when the team uncovers a skeleton in the boot of a car.