Mary aligns herself with France as the threat of England looms; Condé makes an audacious move; Kenna and Gen. Renaude grow closer.

Mary takes extreme measures as she tries to stop Francis from catching Condé; a jealous Catherine wants Narcisse to prove himself; Greer makes a decision that could end her relationship with Leith.

Mary arrives in France to formalize her arranged marriage to Prince Francis, but complications arise when she meets his attractive half brother and skeptical mother in the series premiere of this historical drama about young monarchs.

As they prepare for a feast, King Antoine tells Francis and Mary about England's plans for revenge.

Francis makes a surprising move after being threatened by King Antoine; Bash and Kenna's marriage is in trouble; Leith makes a discovery about Greer's new career path.

In the series finale, Mary changes the course of history with a decision she makes, and her perilous move for survival causes her to have a stunning realization. Meanwhile, Elizabeth steadies herself for war and becomes the instigator in Mary's demise.

Clarissa kidnaps Henry and Catherine's youngest sons, so Catherine turns to Mary and Bash for help. Elsewhere, Lola tries to assist her brother with a debt, but when she gets in over her head, Francis comes to her aid.

A matchmaking event is held for the women in the castle, but Lola doesn't want to take part in it. Meanwhile, Kenna grows frightened when Henry flies into another rage, so she turns to Catherine; and Bash learns firsthand about the horrors of the woods.

Tension rises between the Catholics and the Protestants. Francis receives a gift from his dead father. Kenna is shocked by a discovery.

As Mary and Francis investigate who was behind the poisoning of King Henry (Alan Van Sprang), they unearth secrets of the past which force Mary to confront her feelings for Conde as she attempts to move forward. Catherine finds herself in the middle of a romantic triangle when the Duke of Guise (guest star Gil Darnell) returns, which forces Narcisse (Craig Parker) to commit a hideous act out of desperation. Meanwhile, Greer (Celina Sinden) finds herself in a situation she never fathomed in order to survive.

Mary's mother (guest star Amy Brenneman) returns to advise Mary that her throne is in jeopardy. Mary makes a shocking proposition to Conde, along with a bold move to reclaim her throne. Francis moves closer to Lola after a setback with Mary, while King Antoine (guest star Ben Aldridge) makes Kenna an interesting offer. Megan Follows, Craig Parker, Rose Williams, Celina Sinden, Torrance Coombs and Jonathan Keltz also star.

Catherine is suspicious that Mary and Condé are having an affair; Francis becomes ill; Bash's life is in peril; Leith is forced to guard Claude.

Mary becomes the temporary leader of France; Catherine asks Narcisse for help beating Mary at her own game; Bash sees a familiar face in the village.

Mary realizes she must help Catherine in her quest to become regent, even at the risk of hurting the alliance with Scotland. Claude is determined to help Leith marry while Elizabeth struggles with the prospect of losing Dudley.

Charles' coronation nears, forcing Mary to find a suitor who will be her ally. Meanwhile, Lola discovers who's been poisoning Elizabeth; and the castle's serial killer has special plans for Catherine.

Mary, in order to protect Elizabeth, unknowingly puts Gideon’s life in danger. To save him, Mary turns to another Englishman for help – Robert Dudley. Meanwhile, Bash is determined to track down the men behind the threats to Catherine

Princess Claude makes a surprise visit home. The princess is known to be a provocative and reckless young woman. Greer's wedding tour ends earlier than expected.

Some Vatican inquisitors punish those believed to be a Protestant. Lord Condé ends up being abducted.

Mary attempts to help Condé after finding out that the Vatican is after him.

Mary ends up doing something unexpected. The rivalry between Francis and Condé increases.

Queen Mary struggles to hold on to her power in Scotland amidst Queen Elizabeth's campaign to sabotage her with the help of a new ally in Queen Catherine. Meanwhile, with Francis' fate at odds and Elizabeth distracted by temptation in her first love, Robert Dudley, both queens struggle to rule.

Mary must prioritize her life over her cousin's. Meanwhile, Lola and Elizabeth unexpectedly join forces; Catherine can't escape her past; and Mary and Gideon begin to see each other in a new light.

When Mary arrives in Scotland, she is stunned by the treacherous world it has become and is forced her to keep her royal identity a secret until she learns who she can trust. When Elizabeth jeopardizes her standing with an unbearable new suitor, Lola steps in to help, which causes the Queen to question Lola’s ulterior motives.

When Darnley gets a surprise visitor, his marriage to Mary hangs in the balance. Elizabeth learns her attempt to stop Mary backfired. Meanwhile, Catherine and Narcisse find King Charles and must convince him to return to the castle.

After a tragic earthquake hits Scotland, Mary must face John Knox amidst claims that she isn't coming to the aid of her people. Elizabeth takes drastic measures after she is discovered with Gideon, while Charles makes a decision that backfires.