VIDEO: Sneak Peek - 'The End of Mourning' Episode of The CW's REIGN

On the next episode of The CW's REIGN titled "The End of Mourning", as Mary (Adelaide Kane) and Francis (Toby Regbo) investigate who was behind the poisoning of King Henry (Alan Van Sprang), they unearth secrets of the past which force Mary to confront her feelings for Condé (Sean Teale) as she attempts to move forward.

Catherine (Megan Follows) finds herself in the middle of a romantic triangle when the Duke of Guise (guest star Gil Darnell) returns, which forces Narcisse (Craig Parker) to commit a hideous act out of desperation. Meanwhile, Greer (Celina Sinden) finds herself in a situation she never fathomed in order to survive.

Rose Williams, Caitlin Stasey, Torrance Coombs, Jonathan Keltz and Anna Popplewell also star. Nathaniel Goodman directed the episode written by Laurie McCarthy and Nancy Won. The episode airs Thursday, February 12th on The CW. Get a sneak peek below!