This book is on pre-order until release date of December 16 and book delivery arrives. 
 
A Curse of Ashes by Sariah Wilson
 
For a princess, becoming the savior of a nation could mean sacrificing love and life in this breathtaking conclusion to the epic Eye of the Goddess trilogy by USA Today bestselling author Sariah Wilson.

Princess Lia of Locris is the unlikeliest person to be Ilion’s defender. Once, she’d have gladly seen the entire adversarial nation burn. But much has changed. Ilion is home to too many innocents, including her sister. Besides, there is no escaping the goddess’s command. Lia is Ilion’s prophesied savior.

With that mortal obligation come She must never consummate her marriage to Xander, prince of Ilion, lest she lose her powers of divine magic when she needs them most. Physically bonded to share each other’s pain, these former enemies have grown from merely attracted to something more profound. But what future can they have when Lia’s destiny requires sacrificing her life?

As enemies close in and war threatens everything they love, Lia and Xander must find a way to follow the goddess’s laws while also accepting the truth in their hearts—before the prophecy demands its final, fatal price.