You Should Only Have to Get Rich Once: How to Avoid Toxic Financial Advice and Focus on What Really Matters, by Russell Holcombe.
https://www.amazon.com/Should-Only-Have-Rich-Once-ebook/dp/B0069C2VFA/

I use his concepts of Variable and Fixed income still today. Great decision making framework, and his blog is good too, albeit doesn't post as much as I wish they would.