"Reign" Season 2 Episode 15 - The latest episode of "Reign" entitled "The Forbidden" is all things fans would expect it to be. First off, Mary's mother played by Amy Brenneman, will return to the show simply to have a pep talk with her daughter. Second, a love triangle could be possible.

Last year, "Reign's" executive producer Laurie McCarthy talked about the Mary's mother's visit, which would unlikely lead to an unexpected experience for one of her ladies-in-waiting. McCarthy however refused to divulge who among the ladies this would be.

"You never know what's coming with Marie de Guise, and this time will be no different as she delivers a series of shocking revelations to Mary, and ultimately forces her to face and confront her failing relationship with Francis," shares McCarthy in a report by Entertainment Weekly.

The official synopsis of "Reign" season 2 episode 15 is as follows: "Mary's (Adelaide Kane) mother (guest star Amy Brenneman) returns to advise Mary that her throne is in jeopardy. Mary makes a shocking proposition to Condé (Sean Teale), along with a bold move to reclaim her throne. Francis (Toby Regbo) moves closer to Lola (Anna Popplewell) after a setback with Mary, while King Antoine (guest star Ben Aldridge) makes Kenna (Caitlin Stasey) an interesting offer."

Before "Reign" season 2 episode 15, the last episode featured an investigation regarding King Henry's poisoning. If Mary's mother is set to return in the latest episode, the last episode also featured the return of the Duke of Guise which placed Catherine in a love triangle.

Well, there's another messy and not to mention complicated love triangle in "Reign" season 2 episode 15. With Mary and Francis arguing again, Mary acts on her feelings towards Conde. As for Francis, he rekindles the flame of romance with Lola. Could things get even more complicated than this?

"Reign" season 2 episode 15 airs at 9 p.m. EST. Check out the extended promo for "The Forbidden" below.