'Threshing Day' Updates: Rebecca Yarros Makes Desperate Plea After "Heartbreaking" 'Onyx Storm' Leak

Fourth Wing author Rebecca Yarros about broke the internet when she announced an upcoming book in the series called Threshing Day (especially since it’s not Fourth Wing book 4 !!) — but she also just got honest about how she’s feeling ahead of the release of the book on September 29, 2026. Here’s what Rebecca Yarros had to say ahead of the release of Threshing Day , and why Onyx Storm ‘s release was “heartbreaking.” (function(d,s,n){var js,fjs=d.getElementsByTagName(s)[0];js=d.createElement(s);js.className=n;js.src=”//player.ex.co/player/6f7a4db1-04d2-400a-bc7b-8e2c4b53f660”;fjs.parentNode.ins