"In 1959, Faerie came for a little changeling girl named October Daye and presented her with the Choice that her mother had been struggling to prevent her from ever needing to make. But how did Faerie find her?" (from author's site) The author's site does not give a recommended reading order for this story. This particular reader (BungalowBarbara) recommends reading it after October Daye #7, Chimes at Midnight, as published.
Source · ISFDB CC BY 4.0