Shetland: Series 10

Season overview

Role: Meticulous television and film archivist.
Task: Create a JSON object for "Shetland" Season 10.
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 the primer is an array of strings). Output valid JSON only.
Input Data:
Synopsis: Calder and Tosh investigate the brutal killing of an elderly woman.
Source [1]: Created from novels by Ann Cleeves.
Source [3]: British crime drama produced by ITV Studios for BBC Scotland. First broadcast 10 March 2013. Adapted by David Kane.
Source [4]: Cast includes Alison O'Donnell, Steven Robertson, Lewis Howden, Douglas Henshall. Local police team investigates crimes.
Source [5]: Follows DI Jimmy Perez and his team. Investigates crime in a close-knit island community. Isolated and inhospitable environment.
Overview: Needs to be 160-220 words.
Available info: Calder and Tosh investigate the brutal killing of an elderly woman. The series is a British crime drama produced by ITV Studios for BBC Scotland. It is based on the novels by Ann Cleeves and adapted by David Kane. The show follows DI Jimmy Perez and his team as they investigate crimes within a close-knit island community. The environment is described as isolated and sometimes inhospitable, requiring a uniquely resourceful style of policing.
Problem: The provided synopsis is extremely short ("Calder and Tosh investigate the brutal killing of an elderly woman"). The other sources provide general series info, not specific Season 10 plot details.
Constraint Check: "Write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES." "If a detail is not in the provided material, you omit it rather than guess."
Conflict: I cannot reach 160-220 words without inventing details or repeating the same general series info multiple times. If I repeat the general info to hit the word count, I am being redundant, but if I don't, I fail the word count constraint. However, the prompt says "produce a JSON object with keys: overview: factual 160-220 word summary of this season's narrative arc."
Strategy: I will describe the season's specific plot (Calder and Tosh investigating the killing) and then expand using the general series context provided in the sources (the setting,