Alain would see Rosalia restored.
Caelin would see it destroyed.
But would either succeed?

Surrendered into his mother’s control, Alain must do the unthinkable to save himself, his sister, and reunite with Caelin: he must become the Archon. As Archon, he can undo the rotten tangles of the Legion from within, but he must lie at every turn to keep his secret safe—even from Caelin.

Meanwhile, Caelin rushes into Rosalia to rescue him and unearths a dangerous ancient relic that might obliterate the cryst load upon which the Seat of the Legion rests. The deeper she gets, the more desperate things seem, and nothing can prepare her for what she will find when she reaches the Seat.

Despite all of Alain's machinations and despite Caelin's devotion and strength, the corruption of the Legion may be too deep, and the secret wielded of power in the background too old and powerful to be unseated.