Reign: Season 4

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Reign" Season 4.
Required 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. No asterisks. No headings. No bullet points (in the prose, though the JSON array represents the bullets). Output valid JSON only.
Input: TMDB Season Synopsis and several sources.
TMDB Season Synopsis: "Reign begins its fourth season with Mary vowing to avenge the death of a close friend. Power struggles continue as the beautiful, passionate and poised Queen continues her journey."
Source [1]: "Mary, Queen of Scots, faces political and sexual intrigue in the treacherous world of the French court."
Source [2]: "Reign is an historical romantic drama television series created by Laurie McCarthy and Stephanie SenGupta for The CW. Set in the late 16th century, the series revolves around the life of Mary, Queen of Scots, and her rise to power in the French court. The series stars Adelaide Kane as Queen Mary Stuart..."
Source [3]: "Reign: Created by Laurie McCarthy, Stephanie Sengupta. With Adelaide Kane, Megan Follows, Celina Sinden, Torrance Coombs. Mary, Queen of Scots, faces political and sexual intrigue in the treacherous world of the French court."
Source [4]: "Mary, Queen of Scots, faces political and sexual intrigue in the treacherous world of the French court."
Source [5]: "Reign (2013) ... American and Canadian period romantic drama television series ... aired on The CW from 2013 to 2017."
Overview (Target 160-220 words):
The fourth season of the historical romantic drama series Reign follows the journey of Mary, Queen of Scots. The season begins with Mary making a vow to avenge the death of a close friend. As the beautiful, passionate, and poised Queen continues her journey, she remains immersed in the treacherous world of the French court. Throughout the season, the narrative focuses on the ongoing power struggles that define her life and reign. Mary must navigate the complex landscape of political and sexual intrigue that characterizes her environment. Set in the late 16th century, the series depicts her rise to power amidst these challenges. The season continues to explore the life of Mary Stuart, portrayed by Adelaide Kane, as she manages the various pressures of her position. The central themes involve the dangers of love and the constant threat of political maneuvering within the court. As Mary seeks justice for her fallen