Most know MacKenzie Scott as the philanthropist ex-wife of Amazon founder Jeff Bezos, but she’s also established herself as an award-winning author. Now, the billionaire is set to release her third book, Last Days in Two Nations (A History in Eighteen Minds). She also published a “Release Schedule” and confirmed she will self-publish the novel on Substack. News of Scott’s third novel comes on the heels of her ex-husband filing to sell approximately 15 million Amazon shares, reportedly worth around $4.1 billion. At the time, Bezos theorized that the way to postpone the alleged demise was for Amazon to “obsess over customers.”