"The Email Empire: Master List Building, Sell with Confidence, and Scale Your Business Forever" is a comprehensive guide to email marketing strategies that can help entrepreneurs grow their businesses effectively. 

The audiobook covers key themes such as list building, sales techniques, and business scalability through the use of email marketing. J Emanuel shared his expert knowledge and practical tips on how to craft compelling emails, build a loyal subscriber base, and convert leads into customers with confidence. 

Main characters in this audiobook are the entrepreneurs and business owners who are looking to elevate their marketing efforts and reach new levels of success. Through the author's guidance, listeners are encouraged to implement proven email marketing tactics to increase their revenue and create a lasting impact on their target audience.

The plot of "The Email Empire" follows a step-by-step approach to help listeners understand the importance of email marketing in growing a sustainable business. From setting up automated email sequences to analyzing data for continuous improvement, this audiobook offers valuable insights and strategies for long-term success.