This article is about the science fiction series; The Age of Unreason (ISBN 0-09-954831-3) is also the title of a book by Charles Handy.The Age of Unreason is a series of four novels written by Gregory Keyes: Newton's Cannon (1998), ISBN 1-56865-829-X A Calculus of Angels (1999), ISBN 0-7394-0260-9 Empire of Unreason (2000), ISBN 0-345-40609-5 The Shadows of God (2001), ISBN 0-345-43904-XIts title is a reference to Thomas Paine's treatise The Age of Reason.The story spans the late seventeenth and early eighteenth century, with the action moving between England and France, later involving Russia, Austria, the Republic of Venice, and North America.