The battle for Ciara's power has drawn the full attention of the Emperor and the Imperial Mages, forcing Bolin to put duty above safety and take her to Nisair. It won't be an easy trip, even with an Imperial escort and a Galysian elder accompanying them. Especially since Donovan has found himself some new allies, one of who wields a dark magic that has literally gotten under Bolin's skin.
For Ciara, coming to terms with the increasingly tangible manifestation of her power could destroy her. Even if they make it to Nisair--something that grows more unlikely by the day--there is no surety of safety for Ciara, or any of them. Not with Donovan willing to gamble everything to achieve his goals, or Bolin's uncharacteristically reckless behavior, the result of which is the attention of something that has everyone worried.
Loyalties will be tested, lives will be lost, and no one will emerge unchanged as they find things are not always so clear on the line dividing Darkness and Light.