Alan Lee - "Frodo, Sam, Merry and Pippen on their trip back to the Shire. They seemed to have discovered that something is amiss. One can not miss the trees which are chopped down and the smoke rising from the Mill."
"They were once men; great kings of men. Then Sauron the deceiver gave to them nine rings of power. Blinded by their greed, they took them without question, one by one falling into darkness. Now they are slaves to his will. They are the Nazgul, Ringwraiths, neither living nor dead. At all times they feel the presence of the Ring, drawn to the power of the One."