MacKenzie Scott, the former wife of Amazon founder Jeff Bezos who has given away more than $26 billion to over 2,500 nonprofit organizations, is returning to fiction after a 13-year publishing hiatus. The billionaire philanthropist has announced a new 80,000-word novel, “Last Days in Two Nations (A History in Eighteen Minds),” which she plans to release serially throughout August. The 317-page novel will be released serially throughout August through Scott’s newly launched Substack newsletter, which carries the same name as the book.