Sworn to Secrecy (Courtlight Series #4)

In the heart of the Imperial Court, Ciardis Weathervane knows that death is coming for the empire. With her friends by her side and the new triad of Weathervanes, she's in a race against time to convince the court of the same.

She must do her best to unite kith, mages, nobles and merchants under one cause - the fight to prevent a war. Soon she is forced to keep a secret that could exonerate her mother of the Empress's death, and is always one move away from stepping into diplomatic chaos…