Summary Sage is a GPT built on top of OpenAI's ChatGPT, designed to provide users with succinct and insightful summaries of books. The primary function of this tool is to distill extensive content from books into concise summaries, thereby making it a practical tool for users who do not have enough time to read full books or those who want a quick overview before delving into a new book. To use this tool, users can present a book title they are interested in, and it will return a comprehensive synopsis. Prompt starters such as 'What book would you like summarized?', and 'Can you give me the book's title and author?' are designed to guide the user interaction with the system. Summary Sage may be a beneficial tool for avid readers, literature enthusiasts, students, researchers, or anyone who needs a quick review or prcis of a book. While using Summary Sage requires a subscription to ChatGPT Plus, it delivers value by saving time and streamlining the process of understanding an array of books' key points and thematic strengths.