Caterina was fifteen years old in 1452 when she bore an illegitimate child in the tiny village of Vinci. His name was Leonardo, and he was destined to change the world forever. Caterina suffered much cruelty as an unmarried mother and had no recourse when her boy was taken away from her. But no one knew the secrets of her own childhood, nor could ever have imagined the dangerous and heretical scheme she would devise to protect and watch over her remarkable son. This is her story.