When Time Began: Book V of the Earth Chronicles

They came to Earth thousands of years ago to usher in mankind's first New Age of scientific growth and spiritual enlightenment. Under the guidance of these ancient visitors from the heavens, human civilisation flourished - as revolutionary advances in art, science and thought swept through the inhabited world. And they left behind magnificent monuments -- baffling monoliths and awesome, towering structures that stand to this day as testaments to their greatness.

In this extraordinarily…