In the published novel, this will be the start of chapter two of Part III. It hearkens back to what happened at the very end of Part II, where, as Arpad and Ryland were about to return to the Texas-controlled side of the Mississippi, he received a note of some kind. We know is was significant, otherwise, why is Faustina’s young cousin travelling with them into another battle zone?
I’ve seen what happens right after this memory and am writing it now. This is a very productive weekend!