Tensions between Protestants and Catholics escalate when bloodshed at a Protestant service causes an already concerned Mary and Francis to intervene on the eve of Greer's wedding. Bash and Leith lead a search for the guilty that reveals a surprising secret about Castleroy that could destroy his union with Greer. Meanwhile, Francis receives an unwelcome gift from his dead father. Kenna discovers a sex journal, with clues leading to the best lover at court, who just might be a match for Lola.

Young, reckless and provocative Princess Claude makes a surprise visit home, torturing her already haunted mother, Catherine. Francis is pressured by Narcisse to act against his conscience or risk his throne and his wife. Mary finds a new ally in Condé. Francis confides in Bash and hatches a plot that involves an uncertain Lola. Kenna mistakes Claude for a newfound friend, while Greer returns earlier than expected from her wedding tour.