Nathaniel Middleton

Mary (Adelaide Kane) realizes she must help Catherine (Megan Follows) in her quest to become regent, even at the risk of hurting the alliance with Scotland. Claude (Rose Williams) is determined to help Leith (Jonathan Keltz) marry while Elizabeth (Rachel Skarsten) struggles with the prospect of losing Dudley (Charlie Carrick). Toby Regbo, Torrance Coombs, Craig Parker, Anna Popplewell, Celina Sinden and Ben Geurens also star.

Mary (Adelaide Kane) must find a powerful suitor to align herself with as Charles' (guest star Spencer MacPherson) impending Coronation looms. Lola (Anna Popplewell) stumbles upon the identity of Elizabeth's (Rachel Skarsten) poisoner, while Catherine (Megan Follows) becomes a new kind of victim for the castle's serial killer. Craig Parker, Rose Williams, Celina Sinden, Ben Geurens, Torrance Coombs, Charlie Carrick and Jonathan Keltz also star.

When Prince Don Carlos (guest star Mark Ghanime) of Spain visits France, Mary (Adelaide Kane) uncovers a dark secret he is hiding and enlists in Catherine (Megan Follows) to advise her on how to handle. When Gideon (Ben Geurens), the new ambassador from English court arrives, suspicions arise about what his true intentions are, while Bash's (Torrance Coombs) pursuit of the mysterious killer comes to a head at Greer's (Celina Sinden) tavern. Rachel Skarsten, Charlie Carrick, Rose Williams, Jonathan Keltz, Toby Regbo, Craig Parker and Anna Popplewell also star.

Mary (Adelaide Kane) becomes suspicious of Prince Don Carlos' (guest star Mark Ghanime) true condition and relies on Gideon (Ben Geurens) to help her uncover the truth. Elizabeth (Rachel Skarsten) makes a shocking discovery which could change the course of her reign over England and forces Dudley (Charlie Carrick) to make a tough decision. Meanwhile, Narcisse (Craig Parker) forces Claude (Rose Williams) to marry someone of his choosing, against her wishes. Megan Follows, Anna Popplewell, Torrance Coombs, Celina Sinden and Jonathan Keltz also star.

Mary (Adelaide Kane) might have to sacrifice her cousin's life to save her own, as she and Gideon (Ben Geurens) find themselves in unchartered emotional territory. Catherine's (Megan Follows) past returns to haunt her, while Lola (Anna Popplewell) and Elizabeth (Rachel Skarsten) become unlikely allies. Craig Parker, Rose Williams, Celina Sinden, Torrance Coombs, Charlie Carrick and Jonathan Keltz also star.