Stones of power - David Gemmell

Rebellion and invasion plunge Britannia into the Dark Ages. Chaos and
terror stalk the land, the King slain by traitors, the great Sword of
Power vanished beyond the Circle of Mist.

Saxons, Angles, Jutes
and Brigante tribesman mass together to destroy the realm, aided by the
powers of the Witch Queen and the Lord of the Undead. Against them
stands a weakling boy, and an old mountain warrior.

But the boy
has the blood of kings, and the warrior is Culain, the legendary Lord of
the Lance. And he alone knows the dreaded secret of the Witch Queen.