The Heart of the Heart has been found. In the ruined palace of the Radiant Emperor the Light shard had been hidden for a thousand years, but now a sliver of its power has entered the flesh of Heth Su Canaav. Once Hollow, he has been reborn as one of the Sharded Few. Its discovery will shake the world . . . if anyone lives to tell of its existence. For hunters stalk the refugees from the Duskhold. Powerful Sharded, unnatural sorcerers, and creatures that they cannot yet comprehend. Deryn and Heth must flee to the ancient city of Karath, where they hope answers await about who was behind the attempt to murder Rhenna Shen, and why one of the mysterious Elowyn directed them to find the House of Last Light. The north lurches towards war, Shadow and Storm closing around the flickering Flame, while the Blood scheme in the black ziggurats of the Sanguine City, and far away something stirs in the frozen wastes where the disciples of Ice cling to an ancient faith . . .