Honestly, I think people stress too much about chronology. A good thriller should stand on its own. If an author can't make a book accessible without reading five prior novels, that's a failing. Cameron doesn't have that problem. Pick any book, read the back cover, and if it sounds cool, go for it. The need for a 'recommended order' is a modern fan-construct, sometimes more about collecting than reading. Just read. You'll piece things together, or you won't, and it won't matter because the immediate plot will be engaging. This goes for almost every thriller writer with multiple series.