'Game of Thrones' Season 5 Episode 8 Spoilers: Will Cersei Admit to Incest with Jaime?

Fans of "Game of Thrones", who have already read George RR Martin's books, have an idea of what's in store for Cersei Lannister in the upcoming episodes, as her storyline hasn't been drastically altered by showrunners DB Weiss and David Benioff.

On Sunday's episode, Cersei was arrested after Lancel Lannister confessed to the High Sparrow about his affair with the Queen Mother. The next episode will see Cersei being prevented from sleeping in her cell until she confesses to her crimes, and she will finally admit to sleeping with Lancel, but not to her affair with brother Jaime. Cersei will also dismiss allegations that she has anything to do with King Robert's death.

As a punishment for her crimes, Cersei will be stripped naked and made to walk on the streets of King's Landing as a rowdy crowd jeers.

It is not immediately known how much of Cersei's past the High Sparrow is aware of, but he is someone who has to be dealt with carefully.

"We don't know how much the High Sparrow already knows," Eugene Simon, who plays Lancel Lannister, told TVGuide.com. "That is the nature of his intimidation genius. I think that the High Sparrow has kept his cards very close to his chest. I always believed that the High Sparrow knew, almost from the very beginning, what exactly [everyone] has gotten up to because he would never be able to have as much control if he didn't."

Speaking about what's in store for Cersei, Simon told Vulture that one mistake Cersei committed was underestimating the High Sparrow.

Simon added, "He's actually a very frightening character, because he's so calmly able to convince you of his relatively moderate views on righteousness, when actually he's really dictating the will of the gods. And his version of justice is so backwards, in so many ways. Lancel sees that as empowering. But never underestimate Jonathan Pryce!" 

"Game of Thrones" airs Sundays on HBO.