Calder and Tosh turn their focus onto Lisa, until her confession unearths a shocking event and leads the team back to Annie’s inner circle.

When her friend doesn’t get home one night, Tosh persuades DI Calder – now a resident of the Isles – that something is wrong.

As Calder and Tosh wrestle with the revelation of Annie’s past, Noah offers a cryptic clue about the night she was killed.

Calder and Tosh discover the truth behind Rossi’s mission. They must identify Annie’s killer before he can exact his revenge.

The hunt is on for Ian Bett as a picture of Anton Bergen begins to emerge. Are Calder and Tosh dealing with the revenge of a jealous ex-husband?

The team uncovers the sinister truth behind the facility. But the investigation is diverted when Astrid Jakobson goes missing.

Elderly Shetlander Mima Wilson is found murdered on the archaeological site in the grounds of her croft. Detective Inspector Jimmy Perez and his team investigate. Can Perez unravel the family feuds and secrets that emerge and restore the security of his beloved Shetland Islands?

With two murders and no strong leads, can Detective Inspector Perez and his team apprehend the suspect before crowds descend on the Shetland Islands for Up Helly Aa, the biggest fire festival in Europe?

Tosh believes she has the murderer in custody and tasks the team with finding the evidence to charge. Calder suffers in silence with Jean’s revelation.

Old wounds are painfully reopened for the shocked residents of Ravenswick, as Detective Inspector Jimmy Perez and his team look to a past crime to solve the present day murder of a young teenage girl.

After the discovery of an unknown body, the search for Connor grows increasingly desperate. Perez follows Danny on a perilous journey into his murky past.

A Met detective returns to Shetland on the trail of a vulnerable witness. DI Ruth Calder must team up with Tosh to find the girl before it’s too late.

Calder and Tosh must work together to find the armed killers and prevent further disaster. Howell and Nowak take refuge with a local and wait for a means of escape.

Unnerved by her discovery, Calder decides to stay on in Shetland. Tosh welcomes the support, as the revelation of a tattoo sends the case in a sinister new direction.

Calder initially reels from the awful news, but quickly becomes suspicious. Tosh worries Harry and Donnie with her pursuit of a controversial new theory.

When an old acquaintance of Detective Inspector Jimmy Perez dies in a suspicious car accident on the island, he wonders whether his journalist friend had uncovered a story that cost him his life.

Time is running out for Detective Inspector Perez as prime suspect Peter Latimer lies critically ill in hospital. Was the fire a drunken accident, or was Peter Latimer the second victim of a murderer still free on Fair Isle?

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.

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.

Sure that Zezi is being held on Shetland, Perez and the team ramp up the pressure on their remaining leads. Personally, Perez finds himself in turmoil after his kiss with Alice.

The discovery of Niki’s body intensifies the search for Zezi. Perez feels that time is running out. A desperate Olivia tries to get information from Jamie Hayes.

In the aftermath of the diving incident, the team searches for a link between the two bodies. Meanwhile, Perez must deal with the return of Donna Killick.

The hunt is on for Sandy's attacker, before a shocking confession causes tensions to boil over and some Islanders take justice into their own hands.

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.

As the investigation draws to a close, Tosh and Calder try to unravel the mystery at the heart of the Bains. The identity of the killer lies in the reason why Ellen left Shetland.