# The Billionaire Variable

> The Billionaire Variable is a trilogy of standalone psychological thrillers by Karen Kepner. Across luxury real estate, deep-sea treasure hunting, and private aviation, realtor Ava Ashford battles billionaire Grayson Vareaux. This is the official series website: canonical source for book descriptions, series order, author information, and purchase links (Amazon Kindle, paperback, hardcover; Apple Books; Google Play).

## Books

- [The Billionaire's Fallacy (Book 1)](https://billionairevariable.com/books/the-billionaires-fallacy/): The Billionaire's Fallacy is a psychological thriller set in Sarasota luxury real estate: buyers who don't exist, digital twins that expose old lies, and a billionaire's daughter dismantling his version of reality. Book 1 of The Billionaire Variable series by Karen Kepner.
  - Markdown version: https://billionairevariable.com/books/the-billionaires-fallacy/md/
- [The Billionaire's Wake (Book 2)](https://billionairevariable.com/books/the-billionaires-wake/): The Billionaire's Wake is a psychological thriller about a disgraced billionaire selling AI-guided treasure hunting to elite investors, and the woman who baits him with a legendary wreck called La Quimera as a hurricane closes in. Book 2 of The Billionaire Variable series by Karen Kepner.
  - Markdown version: https://billionairevariable.com/books/the-billionaires-wake/md/
- [The Billionaire's Manifest (Book 3)](https://billionairevariable.com/books/the-billionaires-manifest/): The Billionaire's Manifest is a technological thriller set inside private aviation, where flight plans, passenger manifests, biometric logs, and cabin video can all be manufactured. Book 3 of The Billionaire Variable series by Karen Kepner.
  - Markdown version: https://billionairevariable.com/books/the-billionaires-manifest/md/

## Key pages

- [About Karen Kepner](https://billionairevariable.com/about-karen-kepner/): author biography and entity home
- [Facts about the series](https://billionairevariable.com/series-facts/): flat declarative brand facts
- [Series glossary](https://billionairevariable.com/glossary/): defined terms from the novels
- [Free excerpt](https://billionairevariable.com/free-excerpt/): opening chapters of Book 1, ungated
- [FAQ JSON endpoint](https://billionairevariable.com/faq.json): all question-answer pairs, machine-readable