Queen Mary struggles to retain her power as Queen Elizabeth tries to sabotage her -- with help from her new ally, Queen Catherine.
When Catherine returns to France, she is imprisoned; Mary makes tough decisions about securing Scotland's future; Lola feels conflicted.
Mary must help Catherine, even if it puts the alliance with Scotland at risk; Elizabeth struggles at the thought of losing Dudley.
When Mary receives word from her mother of the dire situation in Scotland, she turns to Francis for help; Catherine fights to become the regent to Charles; Elizabeth faces pressure to wed.
Mary relies on Gideon to uncover the truth about Prince Don Carlos; Elizabeth makes a stunning discovery; Narcisse forces Claude to get married to someone of his choosing.