Iron Flame is the #1 New York Times bestselling sequel to Fourth Wing in Rebecca Yarros' epic Empyrean fantasy series. Set in the brutal and competitive world of Basgiath War College for dragon riders, this 623-page romantasy novel continues Violet Sorrengail's story as she begins her second year of grueling training. After surviving the deadly first year, Violet faces an even more dangerous challenge as the new vice commandant makes it his mission to prove her powerlessness, all while she uncovers a centuries-old secret hidden at the war college that could change everything.

The book features intense action, dragons, romance, and a compelling protagonist who defies expectations despite her physical limitations. Violet must navigate brutal combat training, political intrigue, a secret rebellion against a hidden threat, and her complicated relationship with Xaden Riorson while deciding whether to hide behind lies or aid the revolution. Published by Red Tower Books (Entangled Publishing) on November 7, 2023, this new adult fantasy romance became an instant bestseller, selling over half a million copies on release day and garnering over 400,000 five-star reviews on Goodreads.

This edition features ISBN 978-1-64937-417-2 and is the second book in the planned five-book Empyrean series. The story includes elements of war, battle, hand-to-hand combat, intense violence, graphic language, and mature content. An Amazon MGM Studios television adaptation is currently in development with the author serving as executive producer.