A horrifying discovery at the Hayes house changes the course of the investigation. Perez establishes the probable cause for Daniel's murder and his sister Zezi's disappearance.

The episode was rated 7,80 from 343 votes.

Ignoring Secret Service warnings, Perez and Tosh track down Mathias Soderland. Back on Shetland, a beach memorial service is held for Sally McColl.

The episode was rated 7,83 from 340 votes.

Sandy feels the heat in the aftermath of Calum’s suicide. Convinced that McGuire is the key to cracking the case, Perez travels to Glasgow in an attempt to track him down.

The episode was rated 7,84 from 330 votes.

Perez struggles to deal with what has happened to Tosh as he continues to investigate the murders of Robbie Morton and Michael Thompson, but a shocking discovery finally leads him to the identity of who Thompson was going to testify against.

The episode was rated 7,85 from 351 votes.

A severed hand washes up on a Shetland beach, with further body parts discovered in a holdall that has been dumped at sea. Perez and the team begin a complex murder investigation.

The episode was rated 7,85 from 358 votes.

Perez tries to get the measure of Lloyd. Evidence emerges of another bombmaker. The net closes in around Martin. Sandy uncovers Connor’s interest in a piece of local history.

The episode was rated 7,89 from 207 votes.

DI Perez investigates the disappearance of a vulnerable young man, whose family are new to Shetland. Has whatever they are running from come back to haunt them?

The episode was rated 7,93 from 214 votes.

Perez must re-assess the investigation in the aftermath of the attack. The MIT arrives on Shetland and sets its sights on Malone. Meanwhile, Tosh begins to have doubts about Lars.

The episode was rated 7,94 from 340 votes.

As Perez closes in on the identity of Galbraith’s killer, he struggles with Duncan’s secret, while Donna has one more surprise in store.

The episode was rated 7,98 from 223 votes.

Mounting evidence pushes Perez and the team to revise their view of Connor Cairns. Is he a vulnerable missing person or a killer on the run?

The episode was rated 8,03 from 212 votes.

Perez and his team face a race against time to prevent disaster striking Lerwick. With nowhere left to run, an increasingly desperate killer looks to make a devastating political. As the investigation draws to a close, Perez faces a life-changing decision.

The episode was rated 8,04 from 200 votes.

Perez closes in on Zezi's location at last. But can he reach her before it's too late?

The episode was rated 8,07 from 330 votes.

Perez issues a warrant for Connor’s arrest and looks for the motive behind his bomb-making. Sandy tries to find out what business William Rodgers had in Shetland.

The episode was rated 8,10 from 208 votes.

As the investigation reaches its final stages, Detective Inspector Perez and his team discover the person responsible for the deaths of Robbie Morton and Michael Thompson is closer to home than any of them thought.

The episode was rated 8,11 from 340 votes.

Season Finale - Troubled by historical DNA evidence results, Jimmy has to face the fact that Duncan may have been involved in Lizzie Kilmuir's murder, and potentially Sally McColl's as well. A shocked Duncan is brought to the station for questioning, hurt that Perez would even think him capable of murder. However, the detective knows Duncan's lying - perhaps not about the murder, but about something else significant. So when Duncan finally admits he had an affair with Donna, it's not long before a bombshell is dropped.

The episode was rated 8,12 from 358 votes.