Game of Thrones Season 7 spoilers: Will Jaime betray his sister Cersei?

HBO has released a few photographs from Season 7 of its fantasy drama Game of Thrones, and although the snaps are scarce in details, it gives a hint at where the leads are when the season begins.

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For instance, Jaime will still be protecting Cersei when Season 7 begins. The photograph that released on Thursday shows Nikolaj Coster-Waldau's character standing next to Cersei (Lena Headey). He might not approve of her becoming the Queen, but for now he is doing his duty to protect her.

But how long will Jaime continue to risk it all for Cersei? And what will finally prompt him to turn against his ssiter?

Cersei will die before the series wraps up, and the only thing yet to be revealed is if she is going to be killed by Tyrion or Jaime. According to Maggy the Frog's prophecy, Cersei will be choked to death by one of her brothers. While the popular notion was that Tyrion will be the one to do it, as Cersei has never been nice to her little brother, Jaime's arc in the previous season hints at him growing a conscience and turning against Cersei, who has become the evil Queen.

According to a purported Game of Thrones Season 7 plot, Cersei and Jaime will have a fall out when she refuses to help Daenerys and Jon Snow against the looming threat of the White Walkers.

This is what happens, according to Redditor awayforthelads:

Jon needs to provide proof that the Undead are real. So, he goes beyond the Wall with Hound, Beric, Thoros and Tormund to capture one. They succeed, but Beric and Viserion die in the process. They bring the undead to KL (they have a temporary truce with the Lannisters) and show him to Cersei at the Dragonpit. She loses her shit. She agrees to unite their armies against the WW. But at the last moment, she betrays them and doesn't send troops, so that the WW will thin out their forces. Jaime is mad and leaves her. He rides North to join the armies.