Dive into your creative stream
Shallan: Daughter of rural minor noble family who goes on a journey and ends up in the court of the current political center of her world where she is slightly overwhelmed by everything and is trying to figure out how to save her family. In the process, she discovers a plot of some sort in the underworld of the society and create and alter-ego to infiltrate it.
Vin: Daughter of the underworld who finds herself in a new crew where the rules aren't quite what they used to be and she has to adapt as they plot to completely overthrow society. As part of this, she creates an alter-ego in which she infiltrates the court as a daughter of a rural minor noble family who is here to further her family's interests.
These girls are like two sides of the same fantastic coin and there are two things I really want to read:
1) Shallan and Vin curled up with coffee or tea or something trading infiltration stories and tips with Pattern providing commentary.
2) A scenario where these two are moving in the same court and are initially on opposite sides and they start getting suspicious of each other and eventually one confronts the other (I can't decide which way). After talking they discover that there is more going on than either realized and essentially end up forming their own faction.