Nathaniel Middleton

When Mary discovers a dark secret of the visiting Prince of Spain, she asks Catherine for advice in handling it; the new ambassador from English court raises suspicions; Bash's pursuit of the killer comes to a head.

Mary must help Catherine, even if it puts the alliance with Scotland at risk; Elizabeth struggles at the thought of losing Dudley.

As Charles' coronation looms, Mary looks to align with a strong suitor; Mary discovers the identity of the person who poisoned Elizabeth; Catherine becomes a new kind of victim for the castle's killer.

Mary relies on Gideon to uncover the truth about Prince Don Carlos; Elizabeth makes a stunning discovery; Narcisse forces Claude to get married to someone of his choosing.

Mary may have to sacrifice her cousin to save her own life; Catherine is haunted by her past; Elizabeth and Lola become an unlikely team.

In her attempt to protect Elizabeth, Mary unwittingly puts Gideon's life in jeopardy; Bash is determined to find the men who are threatening Catherine.