Even though Pfizer-BioNTech's Messenger RNA-based COVID vaccine was released first; it is Moderna's vaccine and the relatively unknown company's journey to billions of dollars in profits that piqued the interest of Wall Street Journal reporter, Peter Loftus, who writes about it in his new book, "The Messenger: Moderna, the Vaccine, and the Business Gamble That Changed the World".

Listen now to find out why.