Peter Kerry - The Star Riders and the Mystery of the Fairy Circles

Three little boys, transported 1,500 years into the past, almost alone in the Namibian desert, cared for and guided by an Irish monk and his best friend, a Wolpertinger, supported by bushmen, hunted by a devilish demon and his brutal henchmen, they don't just have to survive the daily dangers of the wilderness but save the world from darkness and the reign of evil before they can return to their own time.