All you can read

If you have Kindle Unlimited or Amazon Prime, you can now borrow both A THRONE OF BONES and A MAGIC BROKEN at no charge. As it happens, at 854 pages, Amazon will pay more for a Prime or a Kindle Unlimited user reading ATOB than Castalia gets for actually selling a book there. However, this means that neither book is presently available in the Castalia store.

We do NOT plan to do this for most of our books, just to be clear.