In the beginning of the book (chapter 2,) Will meets a person who says his name is Ozymandias. Will thinks he is a vagrant and has a cap on, but when Will meets him in private, Ozymandias told Will that he is wearing a cap from a dead man. Ozymandias actually came here to save Will from The Deadly Tripods and told Will about the White Mountains where the tops are covered in snow and best of all,

He's Free!