In a world of towering, sentient mountains, where the people live in harmony with the peaks, Kai, a young mountain climber with the ability to communicate with the mountains, sets out to find the Heart of Stone, a mythical artifact capable of controlling the very tremors of the earth. His journey takes him through treacherous peaks, encountering rival tribes, ancient mountain spirits, and the enigmatic Earthborn, beings born from the very essence of the mountains. Kai's past, marked by a devastating earthquake that claimed his family, reveals a connection to the Heart of Stone that could either bring stability to the world or unleash a catastrophic earthquake that could shatter the planet.