Why is Constantine a giant? Because he gave Christians freedom of religion. Yet also because he radically and thoroughly changed our society, in particular church-state relations, thereby creating the opportunity for the Christian community to experience exponential growth. Because his changes in government, law, religion and art and architecture are so enormous we still see the consequences of his decisions to this very day. Because Constantinian history is relevant to everyone.

Why is Jesus a giant? Because he was the founder of Christianity, the largest religion in the world with 2 billion adherents; because Christianity is one of the five great religions of the world, with followers in every country on the planet and a history stretching back two thousand years; because there remains great interest in the teaching of Jesus, his personality and his life. The origins of a great religion which has filled so immense a place in the history of the world must surely be of interest to everyone.

Why is King Arthur a giant? Because his story has had such strong influences on our understanding of the history of Europe and the English-speaking world. Because the debate about Arthur as a historical figure has been central to understanding the fall of Roman Britain and the formation of England for much of the last 1,300 years. Because Arthur is one of the best-known kings in world history, whose reign was viewed as a golden age, an epoch in which to centre tales of right and wrong, of faith and faithlessness, and of courage and falseness, the moral and spiritual values of which continue to resonate today not least among those who dismiss Arthur as a late literary construct. Because an understanding of Arthur and all the different things he has meant to scores of generations up to the present is fundamental to our understanding of our own past, our understanding of ourselves and the ways in which we can benefit from history.

When a town whose economy is based on selling facts is taken over by the Facttracker's twin, Ersatz, quickly-spreading lies begin changing the world, and a "just small enough boy" must reach the seed of truth before the changes become permanent.