It is 90,000 years ago. On the edge of becoming adults, our two main characters are twins, a girl and a boy who participate in important decisions on how to survive. They face the desperate challenges of climate change and the dangers of terrifying wild animals as their tribe is forced to make life changing decisions to stay alive. The story gives younger readers insights into the historical facts of the time, the heartache and the challenges our ancestors once faced and how they overcame them. Finally, the tribe decides to separate, with one group (Sahul) heading south to warmer climates, and the other group (Sunda) heading north to follow the game and hunt mammoths in the snow. What is to happen after Sunda and Sahul are separated? Where do they go? Find out in Books 2 and 3.