This summary is assembled from a Twitter conversation
Me: Our 2 heroines having considered marriage (w Alithea in male disguise) as a way to spend their lives together, and considered the hazards of discovery daunting, Arabella is making arrangements to join Alithea on her travels also in male disguise. Alithea amuses herself by taunting Arabella's suitors. But then Alithea is persuaded to contribute to a kickstarter for some dude's treatise on moral philosophy and yields to the impulse to summarize its contents for 20 pages or so.