Shetland

After serving a twenty three year sentence for a brutal murder that sent a wave of mourning over the entire island, Thomas Malone returns home to Shetland.

While the hunt is on for Malone's attacker, Tosh investigates Forst Energy in the hunt for Sally's killer.

Perez questions Donna on the DNA result. Tosh arrives in Norway to track down Hagan, but a twist leads Perez and Tosh into the murky world of the far-right.

In Norway, Perez and Tosh track down Mathias Soderland. Back on Shetland, family and friends hold a beach memorial service for Sally McColl.

Perez reassess the investigation in the aftermath of the attack and the MIT arrives on Shetland and sets its sights on Malone.

The personal and the professional collide as Perez finally closes in on the truth behind Lizzie and Sally's murders.