The Gardeners is the sequel to Indigo Autumn, (the sequel to Summer's Portal). Chloe Steffington and her fiance, Dr. David Stewart, seek a route home to Earth from a parallel world. In so doing, they are detoured to an ancient world of legend. The discovery of this civilization's highly advanced science, held in stasis for aeons, holds the key to the final liberation of a humanity forever unknowingly enslaved by a tangent species of human---one created from nature's darkest repertoire---the Vraang. Humanity's fate lies in the hands of the two young adventurers as they attempt to probe this ancient technology, for it contains secrets so fantastic all life on Earth could be forever changed if they are successful in engaging it in time. In conjunction with Chloe and David's efforts a small group of Earth's "Guardians"move feverishly in the shadows of these last hours, their part too a necessity which cannot be denied.