A friendship betrayed. An unfamiliar land. The wind of ruin blow. ¿ Roisin is still reeling from events at the end of A Crown of Blood. She feels lost, broken and alone in the world. Torn with what to do next, Roisin chooses to make the fateful trip across the Skybinder border into enemy territory in the hopes of gaining new allies for the fight against the Soulmongers. At her side is her fox companion, Vulpo; the last of the Bloodsingers, Mei; and a Skybinder of questionable allegiance named Giack. However, Roisin's actions draw the attention of the Skybinder nobility, entrapping her into political machinations with deadly outcomes. Piritta, newly reborn Soulmonger, is tasked with the search for the final member of the Soulmonger Triumvirate to lead the army to victory. And Kaori, leader of the Soulmongers, is given her own task, granting her more power than she could have ever imagined. The choices these young women must make will tear them apart, fracture them all, leaving cracks for something darker to seep in. And in the end, only the one with the strongest resolve will endure. A shocking sequel about survival and the choices one must make to do so, On Winds of Ruin continues the adventure for Roisin and her friends as they face their greatest challenges yet.