First Book ai is an AI-powered ghostwriting tool that claims to help users write a complete book in under 24 hours. This program guides users through a step-by-step process, starting with answering questions to create a detailed outline, followed by AI-generated text drafts that can be edited and refined. Users can then download their completed book drafts as Google Docs, Word documents, or PDFs. It is being marketed on AppSumo with lifetime access for a one-time purchase and offers three licensing tiers, allowing users to write multiple books.