Derfel finds Nimue inside the Isle of the Dead; guilt ridden by the deal he’s been forced to make with the Saxons, Arthur vows to fight to save Britain.

Gorfydd allies with the Saxons and declares war; Arthur admits he exiled Nimue to the Isle of the Dead.

Arthur believes that Bedwin will be able to negotiate peace with Gorfydd; however, when Morgan and Derfel arrive in Powys, they discover a horrific site.