After spending her childhood at a monastery, teenage Mary Stuart arrives in France to formalize her arranged engagement to Prince Francis.

After Mary learns that the English are aware of her fragile engagement to Francis, the two put on a show to protect their alliance; Queen Catherine tries to silence those who know about her plot.

One of Francis' former lovers arrives at the castle -- and brings danger with her; Mary turns to Bash for comfort; Aylee is blackmailed into spying on Mary.

An attempt at scaring Mary causes Queen Catherine to take drastic measures to catch the guilty party; Bash ends up with blood on his hands; Kenna makes a confession.