The 4 season of Shetland was broadcast on BBC One from mardi 13 février 2018 to mardi 20 mars 2018. It consists of 6 episodes, the first one is called "Episode 1" and the last one "Episode 6".
Set against the stark backdrop of Scotland's rugged coastline, DI Jimmy Perez and his team investigate murders in the small island community of Shetland.