A man comes into Pages & Co looking for a book... then suddenly can't remember it. Tilly and her family feel like the world is changing - but can't quite put their finger on why. Meanwhile, the Underwoods are expanding their control over bookwandering - and they still have their sights set on Tilly. Leaving the safety of the bookshop, Tilly heads to America to find the legendary Archivists and save bookwandering... ... or at least, that's the plan. 8+