Korr returns to the Pressure Clans, the orc labor communities that have mined the geothermal depths for generations. He carries the truth about the Giants?they are not prisoners, but custodians, holding the wound of the world together.

The Clans do not believe him. They have been told the Giants are a threat, a burden, a reason to work harder and suffer longer. But when Korr's heart syncs with the seismic pulse of the mountain, he becomes the first Seismic Heart in centuries?an orc whose heartbeat echoes the Giants' pressure.

The Clans are divided. Some see him as a prophet. Others see a traitor. And deep beneath the forges, the Giants begin to ask a question that has not been asked since the Builders fell: "Will you hear us?