The company crosses to Solenthar — a continent no current map shows the interior of. Vorrath navigates by memory of a world that no longer exists. The void is accelerating behind them, and Vaust, who cannot follow, has begun working from what remains.
This is the journey book: unmapped wilderness, lost civilisations, and the long road toward the place the series has been pointing at since the flooded basement. The companions have changed. The world has changed around them. What waits at the end of the road is not what anyone expected.

This is the grand journey book: unmapped wilderness, lost civilizations, and the void accelerating behind them.
The companions have changed enormously. Sable begins to understand what the final part of the prophecy will require of him.
The book ends when Vel Andurath is reached. It is not what anyone expected.