The CW has released the description for the Feb. 5th installment of Reign titled "Sins of the Past".
Season 2 Episode 13 "Sins of the Past"
FRANCIS AND MARY REUNITE AS THEY LEARN OF ENGLAND'S PLAN FOR RETRIBUTION
As the castle prepares for the Winter's Ease Feast, King Antoine (guest star Ben Aldridge) of Navarre reveals to Francis (Toby Regbo) and Mary (Adelaide Kane) England's plan for revenge against France. Bash (Torrance Coombs) learns that an "undead" man has been seen in the village and his efforts to track the man down lead him to a mysterious woman in white. Meanwhile, Catherine (Megan Follows) finds out the cause of her hallucinations.