A Discovery of Witches: Season 3

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object with overview and primer.
Constraints:
Use ONLY provided SYNOPSIS and SOURCES.
No invented details (titles, names, dates, etc.).
No guessing.
Original, neutral, encyclopedic prose.
Plain text (no markdown, no asterisks, no headings, no bullet points in the text itself).
overview: 160-220 words.
primer: Array of exactly 4 concise bullet points.
Output: Valid JSON only.
TMDB Season Synopsis: Season 3 is the final season. Matthew and Diana return from 1590 to find tragedy at Sept-Tours. They must find missing pages from the Book of Life and the Book itself before it is too late. Enemies are gearing up against them. A monster from Matthew's past, who has been lying in wait, will return for revenge.
Source [1]: Series title: A Discovery of Witches. Genre: Sci-Fi & Fantasy and Drama.
Source [2]: Directors: Sarah Walker, Alice Troughton. Cast: Matthew Goode, Teresa Palmer, Valarie Pettiford, Malin Buska. Year: 2018.
Source [3]: Diana Bishop is a historian and reluctant witch. She discovers a bewitched manuscript in Oxford's Bodleian Library. Matthew Clairmont is a mysterious geneticist and vampire.
Source [4]: British fantasy romance series. Manuscript name: Ashmole 782.
Source [5]: Adapted from Deborah Harkness' novels. Extraordinary beings: vampires, witches, and daemons.
Goal: 160-220 words.
Drafting:
In the third and final season of the British fantasy romance series A Discovery of Witches, Matthew Clairmont and Diana Bishop return from a trip to the year 1590. Upon their return, they encounter tragedy at Sept-Tours. The narrative follows their urgent quest to locate the Book itself along with the missing pages from the Book of Life before time runs out. As they navigate these challenges, their enemies prepare to move against them. Additionally, a monster from Matthew's past, who has been lying in wait, returns to seek revenge. This series, which is adapted from the best-selling trilogy of novels by Deborah Harkness, explores a secret underworld of extraordinary beings, including witches, vampires, and daemons, who hide from human persecution. Diana Bishop, a