Donald Miller's book "Building a StoryBrand," which argues that companies should clarify their messaging by focusing on the customer's story, not the company's own. Miller proposes a framework called "StoryBrand" that positions the customer as the hero and the company as the guide. The framework consists of seven core elements: a character (the customer), a problem, a guide (the company), a plan, a call to action, a failure, and a success. By understanding these elements, companies can create a compelling narrative that resonates with customers and drives business growth.