The Prince of Ravens by Hal Emerson
Summary: The Prince of Ravens has vanished.
Word spreads quickly from the Fortress of the Empress, through the dark streets of Lucien, and to the far corners of the Empire of Ages. The Children are summoned to the Fortress, and the people talk in muffled whispers, if they dare to talk at all, of secret plots and ancient prophecies. Some say the Prince was murdered, others that he was kidnapped; but underneath it all runs a darker word, one full of terrifying possibility:
Rumor begets rumor, and soon the whisper of truth is lost in the swirling winds of growing fear. For the Prince of Ravens is the prophesied Lord of Death, and on his shoulders rests the fate of the Empire.