You can find the hardcover or paperback editions at retailers such as Barnes & Noble .

Amazon.com: Iron Flame (The Empyrean Book 2) eBook : Yarros, Rebecca: Kindle Store. Amazon.com Iron Flame by Rebecca Yarros, Paperback | Barnes & Noble®

You can purchase the digital version through the Amazon Kindle Store or listen to the audiobook on platforms like Libby.

The full text of is a 640-page fantasy novel available through several official channels:

While there is no book titled "Iron Wings," you are likely looking for the second book in by Rebecca Yarros, titled Iron Flame .