As Francis leaves Court to find Lola and his child, he must try and avoid the plague, back at Court Mary and Catherine must keep safe from the plague while the nobles and servants are getting sicker and sicker.

As Francis and Lola start the preparations for their son's christening, Mary and Lola make a scheme to help Estelle from Lord Narcisse. Mary gets shocking news that will change her life and Greer tries to tell Castleroy how she feels.

Mary and Catherine leave for a town when their carriage is overrun and they leave for safety, but they are far from that. Lola and Narcisse become closer and Mary and Francis are still having some problems.

Mary and Condé continue to make arrangements to go to Scotland, while Condé continues to meet with Elizabeth's envoy. Catherine becomes suspicious of the relationship between Mary and Condé. Leith offers to try and help Greer.

As Bash is being healed by the white witch, an old enemy shows up. Francis is on the edge of death and Mary must help Scotland from being under attack. Mary must make a decision to stay with Francis or go to Scotland with Conde.

After an attack on the castle everybody is very scared; Conde finds news out about Mary; Catherine is determined to hurt Narcisse; Bash brings Delphine to the castle but what does she have up her sleeve?

As Francis thinks Mary is turning against France, she risks everything in order to take Conde down; Catherine meets with Queen Elizabeth and has a proposition for her; Kenna's secret will seal the fate of her relationship with Bash.