Tower of dawn / Sarah J. Maas.

Chaol Westfall and Nesryn Faliq have arrived in the shining city of Antica to forge an alliance with the Khagan of the Souther Continent, whose vast armies are Erilea's last hope. But they have also come to Antica for another purpose: to seek healing at the legendary Torre Cesme for the wounds that Chaol received in Rifthold. After enduring unspeakable horrors as a child, Yrene Towers has no desire to help a young lord from Adarlan, let alone heal him. Yet she has sworn an oath to assist those in need - and will honour it. But Lord Westfall carries darkness from his own past, and Yrene soon comes to realise it could engulf them both. And deep in the shadows of distant mountains, where warriors soar on mighty ruks, long-awaited answers slumber. Answers that might offer their world a chance at survival - or doom them all.