The Grey King

There was a boy named Will that visits Wales to recover from hepatitis.  Will was going to have to save the world because the dark was rising.  To win against the dark he must find the harp of gold to wake the 6 sleepers to battle evil.  He was the last born of the circle.  Will soon found a pale boy named Bran.  An evil man, Caradog Prichard, kills Cafal, Bran's dog, who was able to see things that others could not see.  In between two hills, Will and Bran will find the harp of gold.  Caradog Prichard put the Harp in the lake after they wake the 6 sleepers.  They conquer the dark,  The Grey king gives up his battle, and the light rises.