As Mary and Francis investigate who was behind the poisoning of King Henry, they unearth secrets of the past which force Mary to confront her feelings for Condé as she attempts to move forward. Catherine finds herself in the middle of a romantic triangle when the Duke of Guise returns, which forces Narcisse to commit a hideous act out of desperation. Meanwhile, Greer finds herself in a situation she never fathomed in order to survive.

When King Antoine threatens to tell Francis of Mary and Condé's evolving relationship, Francis makes a shocking move. Bash and Kenna's marriage is beyond repair after he learns of her scheming, while Leith discovers Greer's unsavory new career path.