Sherlock: Series 2

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Sherlock" Season 2.
Constraints:
Use ONLY provided synopsis and sources.
No invented titles, names, dates, counts, awards, ratings, etc.
If not in material, omit.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points (except the primer array).
Output: Valid JSON only.
JSON Keys:
overview: Factual 160-220 word summary of the season's narrative arc.
primer: Array of exactly 4 concise bullet points summarizing essential previous lore, character positions, and stakes.
[1] TMDB: "Sherlock Season 2 continues the overarching saga across 3 episodes." "A new sleuth for the 21st century." "A modern update finds the famous sleuth and his doctor partner solving crime i"
[2] Wikipedia: "British mystery crime drama television series based on Sir Arthur Conan Doyle's Sherlock Holmes detective stories." "Created by Steven Moffat and Mark Gatiss." "Stars Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Doctor John Watson." "Thirteen episodes were produced, with four three-pa" (cut off).
[3] IMDb: "Created by Mark Gatiss, Steven Moffat." "With Benedict Cumberbatch, Martin Freeman, Una Stubbs, Rupert Graves." "In modern-day London, brilliant but eccentric detective Sherlock Holmes teams with war veteran Dr. John Watson to crack baffling crimes, outwit formidable foes, and aid Scotland Yard with razor-sharp d" (cut off).
[4] Simkl: "Crime, Drama, Mystery, Suspense, Thriller; Sherlock Holmes and his partner Dr. John Watson solve crimes in 21st century London."
[5] Plex: "2010.07.25. In modern-day London, brilliant but eccentric detective Sherlock Holmes teams with war veteran Dr. John Watson to crack baffling crimes, outwit formidable foes, and aid Scotland Yard with razor-sharp deduction."
Overview Requirement: 160-220 words.
Problem: The provided sources contain zero specific plot details for Season 2. The only thing mentioned about Season 2 is that it "continues the overarching saga across 3 episodes."
Constraint Check: "You write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES. You never invent or guess...