"Reign" goes between the lines of the history books, in the story of Mary Stuart (Adelaide Kane), the young woman the world would come to know as Mary, Queen of Scots. Queen of Scotland since she was six days old, the teenage Mary is already a headstrong monarch – beautiful, passionate, and poised at the very beginning of her tumultuous rise to power. In order to secure Scotland’s strategic alliance with France, Mary is intended to marry the French King’s dashing son, Prince Francis (Toby Regbo). But the match isn’t signed and sealed: it depends more on politics, religion, and secret agendas than affairs of the heart. Prince Francis is intrigued by the fiery Scot, but like most young men, he resists the idea of settling down into marriage. Although an attraction between Mary and Francis is ignited, a royal triangle forms when Francis’ illegitimate half-brother Bash (Torrance Coombs) catches Mary’s eye. While at French Court, fierce foes and dark forces conspire to sabotage Mary’s marriage to Francis and even threaten her life until a mysterious shrouded guide becomes her ally. With danger and sexual intrigue around every dark castle corner, Mary must be ready to rule the new land and balance the demands of her country and her heart.