Rage of a Demon King is the third book of The Serpentwar Saga.
In my opinion Rage of a Demon King is a readable book, but it's not as good as some of the previous books (Rise of a Merchant Prince and The Riftwar Saga books were much more enjoyable books).
This book can be recommended to fans of Raymond E. Feist. If you like Feist's books, you'll probably like this book.