Tuuli is a prehistoric girl, travelling with her tribe through the seasons – making camp, hunting for food and protecting themselves against the many hazards that the climate throws at them. Tuuli knows there’s a bigger world out there, and when she spots a strange boy lurking outside their camp, she realises that he might hold the adventure she is looking for.

He is from another tribe, sent to find safer ground and as he and Tuuli strike up an unlikely friendship, they set out on a journey that will impact the rest of human history.