Arya Kills Littlefinger
Littlefinger is living on borrowed time at this point. He may have vastly underestimated his opponent in Arya. His hope is that the scroll will turn Arya against Sansa, but it may lead to her realizing he is the true threat to her family's happiness. The youngest Stark sister isn't afraid to take matters into her own hands, and rather than turn on Sansa, she could simply dispose of Littlefinger . . . using his own dagger, of course.