Rebecca Yarros Just Announced Surprise New 'Fourth Wing' Book 'Threshing Day' — & It's Not Book 4

Well, I’m not usually thrilled to be wrong, but after I reported that Rebecca Yarros teased Fourth Wing book 4 on her Instagram, the author proved me wrong. She announced a brand new Romantasy book called Threshing Day that will be on its way to all our shelves…but the story merely serves as an in-between for the series, not an official book 4! Here’s what we know about Rebecca Yarros’ Threshing Day , the next Fourth Wing book.