In the third book of the series, the threat of war looms large within the Martial Empire. Helene Aquilla, known as the Blood Shrike, strives to protect her sister and the empire, facing dangers from the unstable Emperor Marcus and the power-hungry Commandant, Keris Veturia. Meanwhile, Laia of Serra understands that the fate of the world hinges on stopping the Nightbringer, dealing with unanticipated threats along the way. Elias Veturius, now the Soul Catcher, must reconcile his duty with his personal sacrifices, torn between his responsibilities and his love.