Shetland: Series 5

Season overview

Role: Meticulous television and film archivist.
Task: Write a JSON object for "Shetland" Season 5.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints: Use ONLY provided synopsis and sources. No invented facts. No markdown/asterisks/headings/bullets in the prose (though primer is an array). Output valid JSON only.
Input: TMDB Season Synopsis and several sources.
TMDB Season Synopsis: A human hand washes up on a Shetland beach. More body parts are found in a hold-all dumped at sea. Victim is a young Nigerian man seen in Lerwick. DI Perez investigates the murder and searches for a vulnerable young woman. This leads to uncovering a human trafficking network in Scotland's remote rural communities.
Source 1: Created from novels by Ann Cleeves.
Source 2: British crime drama produced by ITV Studios for BBC Scotland. First broadcast March 10, 2013. Based on novels by Ann Cleeves, adapted by David Kane.
Source 3/4: Cast includes Alison O'Donnell, Steven Robertson, Lewis Howden, Douglas Henshall. Local police team investigates crimes in the close-knit island community of Shetland.
Overview (Goal: 160-220 words):
The narrative of Shetland season five begins when a human hand washes up on a beach in the Shetland islands. Shortly after this discovery, additional body parts are found within a hold-all that had been dumped at sea. The investigation identifies the victim as a young Nigerian man who had been spotted in Lerwick a few days prior to the discovery. As DI Perez investigates the murder, the case evolves into a search for a vulnerable young woman. This investigation eventually leads Perez to uncover a complex network of human trafficking that operates across the remote rural communities of Scotland. The series, which is a British crime drama produced by ITV Studios for BBC Scotland, follows a local police team as they investigate crimes within the close-knit island community of Shetland. Based on the novels by Ann Cleeves and adapted by David Kane, the show features a cast including Douglas Henshall, Alison O'Donnell, Steven Robertson, and Lewis Howden. The season focuses on the dark reality of human trafficking and the investigation into the death of a young man in the islands.
Word Count Check (Overview):
"The narrative of Shetland season five begins when a human hand washes up on a beach in the Shetland islands. Shortly after this discovery, additional body parts are found within a hold-all that had been dumped at sea. The investigation identifies the