: The entire 9-book series is available on Amazon , with many titles included in the Kindle Unlimited subscription for free reading.
If you are looking for an omnibus (a collection of multiple books in one volume), there are two official sets available:
You can find these books and omnibuses through official retailers and libraries:
: This second volume contains the next four novels: The Province , The Nation , The Planet , and The System . Where to Find the Series
: This collection includes the first four volumes of the series: The Laboratory , The Airship , The District , and The Metropolis .