Book 6 was Book 6 was Upright Women Wanted by Sarah Gailey
Even in future-America there are still little pockets of hope.
Rejecting the life her father has chosen for her, Esther runs away to join the travelling librarians.
Review: https://app.thestorygraph.com/reviews/fdda64dd-98d3-4bdd-abcd-7cfd8f62b3cd?redirect=true