As a dark winter of despair seems to close in on the world... Nine-year-old Diana Cerchier has decided to go on an adventure. She wants to follow the brook behind her house back to its source. Inspired by her own spirit of adventure as well as the legends of past explorers who sought the source of the mighty Nile, she begins her quest on a late autumn day. Diana's journey will take her through wonders and perils that reflect an all too fallen humanity that has lost touch with the source and the light. And so as the darkness descends, the last hope for the world lies in one little girl. To save the world, she must find the Source.