Curse and Crystal Thorns - Fae and Crystal Thorns, #4

The battle for the land has only just begun in Curse & Crystal Thorns, the magical and adventurous 4th book in the Fae and Crystal Thorns series. The king may be vile but finding him is their only chance to save the court. Chloe embraces Faerie as her home and is more determined than ever to save it from defeat. After discovering and using balance shards to create their own magic, the enemy mortals threaten to take over Crystalfall. Chloe and Quintus must find a way to stop them.
Their greatest obstacle is repairing their own broken bond, so that Quintus's magic can be restored. Being forced to spend time together is difficult when they're still angry with each other. It doesn't help that they must find a king, who is not virtuous or kind, but he is still their only hope. Without him, the court will be lost forever. The Court of Crystalfall is made of glittering jewels, and with magic flowing through it once again, it's more beautiful than ever.
But Chloe and Quintus must act quickly to save it, or all will be lost.