Rebecca Yarros' "Fourth Wing" and its sequel "Iron Flame" have captivated readers. Despite a messy rollout, "Iron Flame" became an instant New York Times bestseller, just as the first installment in the series, "Fourth Wing," was when it was released in April. This article contains heavy spoilers for "Fourth Wing" and "Iron Flame." Yarros' third book will have a lot to explore in terms of Violet's power and her relationship with XadenRebecca Yarros wrote "Fourth Wing." Advertisement"Every single hint you would need to know what her second signet is is in 'Iron Flame,'" she told Variety's Jennifer Maas.

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