A dark power. Sanaa is bound, force to serve to the Fae Empress, Sorcha's, will. Her dark power lingers inside of Sanaa forcing her to follow the empress to the capital of the Fae Courts: the Citadel. A challenge. August and the others are not in the Citadel for long before Nova makes her next move. They are sent out to find Argentau, the mythical waters that claim to allow anyone to look into the future--or the past. A promise. Aregntau promises insight into the threat that is Nova. But it also promises insight into new threats and dangers Taira and the others will face. The clock ticks on as they must reach Argentau and hope to discover what Nova is planning before it is too late.