S1, E1: After spending a childhood safely hidden away in a monastery, a teenage Mary Stuart arrives in France where she has been sent to secure Scotland's strategic alliance by formalizing her arranged engagement to the French King's dashing son, Prince Francis. Further complicating things is Bash, Francis' handsome, roguish half-brother and Francis' mother, Queen Catherine. When the strong-willed Queen learns of a prophecy that marriage to Mary will cost Francis his life, she is determined to save her son, no matter how many others have to pay with their lives.