It is a tale of a hero cursed with immortality and forced to wander for eternity between the worlds of magic and mortals.
In 1185, while making a pilgrimage to Canterbury, William Palmer happens to mention in conversation that he hopes the Church in England will soon eradicate the foolish belief in the Otherworld.
Unfortunately for William, his fellow pilgrim angrily reveals himself to be the king of the Greyfolk and places a curse on him that condemns him to roam endlessly between the two worlds.
Known as Pilgrim, his mission is to maintain the uneasy balance between the worlds and to protect the human race from the enemy whose existence it stubbornly refuses to acknowledge.
He undertakes a series of quests in the hope that the curse will be lifted, and finds himself, centuries later, in modern times.