Tam Macaulay is Cal and Will's uncle, who lives in the Colony. He is a troublemaker for the Styx, and the leader of a rebellious "group" of Colonists. He is the member of Will's real family who "accepted him (Will) back in…without any hesitation." He was the person who created the plan to break Chester out of jail and escape to the Eternal City. Sadly, he dies at the end of the first book, leaving Cal, Will, and Imago sad. Will sees visions of him later in his adventures.