Following the destruction of the castle by the Knights, Rook seems to have disappeared underground. But Lorcas, Zumar, and Tomash discover that there are big plans afoot, and the future of one or all of them may be in danger. Meanwhile, the Knights set their own, devastating plan in action. If it succeeds, Rook may be disabled for generations or even destroyed. If it fails, the Knights risk increasing the Fell Ken's power astronomically. Just how sneaky has Rook been - and what will he do to save himself?