Rebecca Yarros announces new Fourth Wing book, Threshing Day – and pre-orders are half price

Fourth Wing fans, the wait is nearly over. Rebecca Yarros has finally announced the new book in the record-breaking ‘romantasy’ series. Arriving in September 2026, Threshing Day is already available to pre-order at half price. Like millions of others, I found Fourth Wing to be a gateway to romantasy. The TikTok-viral genre is a literary phenomenon, pushing established authors off global bestseller lists and reigniting a childhood love of reading for many. Be it Sarah J Maas’s (A Court of Thorns and Roses) world of shapeshifting werewolves, fairies, and folklore, or Yarros’ Empyream universe of sentient dragons and magical abilities, there are certain elements that all the best romantasy books have in common: found family, enemies-to-lovers storylines and, perhaps most famously, smut. Fourth Wing is arguably the most popular. Onyx Storm, the latest title released last year, became the fastest-selling adult novel in two decades. But with all the hype and speculation surrounding Threshing Day – particularly given Onyx Storm’s cliffhanger ending – Yarros looks to break her own record. I’ve always been a big reader, but wrongly dismissed romantasy in favour of more literary fiction – that all changed with Fourth Wing. Drawing comparisons to nostalgic YA series, including The Hunger Games and Harry Potter, Yarros’s books are set in the brutal world of a dragon-riding academy, where political intrigue combines with romance. ‘Threshing Day’ by Rebecca Yarros, published by Piatkus: Was £22, now £11, Amazon.co.ukAmazonBoth the title, Threshing Day, and the cover have been unveiled for Yarros’ new Fourth Wing book. Plot details remain thin on the ground, but the book cover reveals that 13 “unforgettable stories” will build tension toward “one legendary day”. Yarros said at a Disney event in April that multiple POV’s – as seen at the end of Onyx Storm – will continue in the sequels for extra character development.The book cover concludes with: “The bond that changes everything”. This could refer to either a dragon bond or the relationship between Violet and Xaden, which reached a crisis point at the end of Onyx Storm. Yarros has previously said that Xaden will be entering his “villain era” in the fourth book. She’s also told fans that Violet will realise the true reason why Xaden married her. Readers can also look forward to loose ends being tied up, including the disappearance of Xaden and the other missing riders, the location of the missing eggs, and what the dragon Andarna learned from her time with the irids. At the Disney event, Yarros also revealed that a dragon is lying about its name, Dain and Sloan are “endgame” – which she has been planning from the start – and Ridoc will get more of a storyline. She also said: “Someone you love won’t make it in book four”. Released on 29 September 2026, pre-orders are already open for Threshing Day – and half price at Amazon.