A new adventure series about the pivotal moments of discovery through the ages, bringing the past to life with a generous helping of fantasy and humour. Shaman by name and shaman by nature – Billy just hasn't found his magic ... yet. His selfish, globetrotting parents abandon him for yet another summer in Charles Darwin's strange, museum-like house, where Billy stumbles across a 200-year-old giant talking tortoise named Charles Darwin, by the famous man himself. Charles D, the tortoise, knows every inch of the house and every artefact in it, and he's keen to help Billy realise his powers and set him on the path to adventure. A beautifully carved Inuit ivory necklace is the first object that whisks him back in time to the shrieking chaos of an Arctic blizzard to meet its rightful owner, a girl called Ahnah, her shape-shifting grandmother and the mysterious explorer Pytheas.