A Portuguese prince offers much-needed aid to Scotland if Mary accepts his marriage proposal and break things off with Francis. Elsewhere, Francis' feelings for Mary lead him to put Bash in a risky situation.

Mary has a chance to get out of her engagement, but it requires lying and sentencing a man to death. Meanwhile, Francis and Bash suspect that Tomas may be disguising his real motives.

An ex-lover of Francis' arrives and brings danger with her, so an uneasy Mary turns to Bash for comfort. Meanwhile, Queen Catherine persuades Aylee to snoop on Mary; and Bash lands in hot water with heretics, who accuse him of disrupting a sacred ritual.

Mary and Francis are taken hostage when the castle falls under siege, and Catherine makes a shocking suggestion in an effort to save them. Meanwhile, Diane reveals to Bash that she's plotting to have him declared legitimate.

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.

Bash saves Francis' life while they're in the woods exploring the latest ominous threat. Meanwhile, Henry becomes obsessed with a servant who won a contest; Greer is seen kissing a kitchen servant; and Henry forces a new couple into a union.

Mary hires a mercenary to help her save Scotland. Meanwhile, Francis prepares France to wage war on England, and Leith becomes his ally in this endeavor; and Lola and Julien's bond deepens, but she fears he will betray her.

Mary and Francis take drastic action in response to Henry's madness. Meanwhile, a terror in the woods puts everyone in peril; and Mary makes a bold choice when she discovers Lola is in the midst of a life-threatening labor.

Francis and Mary's new rule is threatened when a plague ravages the land. Kenna's life is at risk. Greer discovers something shocking about Leith.

A powerful and dominating Lord learns Mary was responsible for his son's death, he demands retribution. Francis and Lola return to the castle with their new son.

Shadowy riders have attacked a shepherd, Lord Conde and Bash investigate. Mary reconsiders her relationship with Lola. Leith returns to court.

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

Mary and Catherine have to hide their identities when they meet a mob of angry peasants. Lola wants to become independent.

Francis comes to a surprising decision. Mary takes part in a treacherous mission with Lord Condé.

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.

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.

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 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.

Francis and Mary are forced to set aside their differences and determine the extent of Condé's betrayal; Catherine teaches Narcisse a lesson; Bash brings Delphine to the castle.

As Francis thinks Mary is turning against France, she risks everything to take Condé down; Catherine meets with Queen Elizabeth; Kenna's secret will seal the fate of her relationship with Bash.

Elizabeth must deal with the political backlash of harboring Catherine in England, while Catherine is imprisoned upon her return to France. Mary is forced to make some difficult decisions about securing Scotland's future and Lola is conflicted in her feelings for Narcisse.

When King Antoine unexpectedly returns to Court, Mary must help Francis hide his weakening condition long enough to secure his family's future. With the Throne in jeopardy and time running out, they must turn to an unlikely ally in need of redemption.

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.

Mary unearths a dark secret being kept by a Spanish prince, so she seeks Catherine's counsel. Meanwhile, suspicion surrounds a new ambassador from English court; and Bash's quest to find a mysterious murderer takes him to Greer's tavern.

Claude is forced to marry someone selected by Narcisse. Meanwhile, a surprising discovery is made by Elizabeth, and it could alter her reign; and Mary asks Gideon to help her confirm her suspicions about Prince Don Carlos.

Mary's feelings for Gideon are hard to suppress, but she does her best as she seeks political allies. Meanwhile, Elizabeth and Greer face gut-wrenching scenarios; Claude is in danger on her wedding night; and a power struggle over the regency continues.

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

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 Mary is presumed dead, Elizabeth asks for Lola's help in taking the Scottish crown for herself; James must defend Mary's throne from John Knox; Mary faces Francis's killer.

Mary makes a bold move to defend her reign in Scotland, which results in a battle royale with her cousin, Elizabeth. Lola is accused of a heinous crime and suffers the drastic consequences. Meanwhile, back in France, Catherine finds that Charles has returned a changed man after paying a price for his mother's relentless quest for power.

When Lord Darnley surprises Mary with a visit in Scotland, Mary sees a glimmer of a union that could be more than just political. Elizabeth fights to gain allies in her favor and Catherine must work to get Claude back on track by finding her a new husband.

In order to get Mary to agree to a marriage, Lord Darnley must demonstrate his loyalty when she voices her concerns about his true intentions. Catherine and Narcisse work to repair King Charles' reputation after rumors spread about his strange behavior and threaten the throne.

Mary must deal with the political repercussions of a potential marriage to Lord Darnley and King Charles disappears, leaving Catherine to pick up the pieces. Elizabeth comes to Gideon's aid, while Claude receives an interesting proposition.