Alone and exhausted after her month-long sojourn as a shooting star, Solina Mundy flees to southern California to lie low, recuperate, and plot a survival strategy. The one person she trusts to watch her back is her best friend, Skyla Ramirez. But Skyla has been missing for weeks.

The arrival of a dangerous stranger and the discovery of a legendary weapon of mass destruction forces Solina out of hiding and back into the fight for her life. Solina knows she won't last long on her own. She must find out what happened to Skyla and unite her contentious allies if she hopes to track down this devastating weapon before her enemies use it to burn the world to ash.