Tower of Dawn

Chaol Westfall has always defined himself by his unwavering loyalty, his strength, and his position as the Captain of the Guard. But all of that has changed since the glass castle shattered, since his men were slaughtered, since the King of Adarlan spared him from a killing blow, but left his body broken.

His only shot at recovery lies with the legendary healers of the Torre Cesme in Antica—the stronghold of the southern continent's mighty empire. And with war looming over Dorian and Aelin back home, their survival might lie with Chaol and Nesryn convincing its rulers to ally with them.

But what they discover in Antica will change them both—and be more vital to saving Erilea than they could have imagined.

You should read Tower of Dawn if you are a writer because:

• Maas is an expert at writing from multiple perspectives. All of her viewpoints are convincing and she's really good at maintaining the pace of the novel even when swapping between characters in very different places. She also keeps readers waiting to discover if her characters will get themselves out of jeopardy. 
• The world building over the course of this series has been so intricate, complex and enthralling. There are so many layers to her world, and centuries of history for multiple nations, continents and races. 
• Maas side-characters are just as developed as her main ones. You can imagine many of her supporting cast starring in their own novels.