Riley works the reference desk, and the patrons never stop coming. Each one wants a chapter number, and the catalog in front of her is sorted but never fully alphabetized by patience — she doesn’t get to flip through it card by card. You’re making every call she makes: which card to check, which half to abandon, and when to finally say a chapter simply isn’t here. If you haven’t run The Halving Chamber yet, do that first — this mission assumes you already know why each branch is the right one, not just which button to press.