Ghostbook is a map of your online accounts, not a vault of passwords. It remembers which email you signed up with, which username you picked, and how to reset access, so the next time you forget, 'Forgot password' works on the first click. Gemma, an open-weight model, turns messy notes into structured entries, answers questions about your accounts in plain language, and writes a haunting report about the forgotten accounts lurking in your life.