When frost appears on the bindery windows in April and Marge hides under the standing press, Tilly knows something dangerous is coming. The man who steps through her door wears expensive gloves and a smile that doesn't belong to him—and he's come for something Aunt Hazel left behind. As the Archive finally makes its move to collect what they believe they're owed, Tilly discovers that some debts run deeper than money, and some bindings hold more than just pages together.

The truth about Hazel's final work can no longer be avoided, and Bram finally reveals what he's been waiting to tell her. In a world where books can hold living minds and knowledge itself can be dangerous enough to lock away, Tilly learns that her inheritance includes obligations she never agreed to—and her aunt may not be as gone as she thought.

In this episode:

- A mysterious courier from the Archive arrives with an ultimatum

- Bram reveals the truth about what Hazel was really binding

- The nature of dangerous knowledge and those who collect it

- Marge demonstrates that cats know things humans are still learning