Iron Flame is the instant #1 New York Times bestselling sequel to Rebecca Yarros' groundbreaking fantasy romance novel Fourth Wing, the second book in The Empyrean series. This thrilling 640-page hardcover edition was published by Entangled Red Tower Books on November 7, 2023.

The story follows Violet Sorrengail as she enters her second year at Basgiath War College, where the real training begins. After surviving Threshing and her first year, Violet faces even more grueling and maliciously brutal challenges designed to stretch dragon riders' capacity for pain beyond endurance. With a new vice commandant who has made it his personal mission to teach Violet exactly how powerless she is unless she betrays the man she loves, and the real secret hidden for centuries at Basgiath War College now revealed, Violet must rely on her wits and will of iron to survive. The novel features heart-pounding romance, intense fantasy action, and follows the principle that dragon riders make their own rules.

Iron Flame has received widespread critical acclaim, being named an Amazon Best Book of 2023, Apple Best Book of 2023, Barnes & Noble Best Fantasy Book of 2023, and appearing on NPR's "Books We Love" 2023 list. A TV series is now in development at MGM Amazon Studios with Michael B. Jordan's Outlier Society producing. The book contains trigger warnings for war, battle, hand-to-hand combat, perilous situations, blood, intense violence, brutal injuries, death, poisoning, graphic language, and sexual content.