Eratosthenes, one of the greatest thinkers of antiquity, comes back to life in our time and finds himself involved in a surreal confrontation: defending the idea of a spherical Earth against those who today argue the opposite. In this brilliant and provocative novel, the ancient Greek scientist dialogues with characters from the present in a series of intense and thoughtful encounters. Each chapter explores a scientific, philosophical, or cultural theme, comparing classical rationality with the contradictions of contemporary thought. The narrative blends historical and fantastical elements, with an accessible but cultured style that intrigues and provokes thought. The reader will find themselves traveling through time without leaving the present, on a journey that questions modern certainties. Through sharp arguments and moments of irony, the book shows how knowledge is a fragile legacy that must be defended with clarity. A perfect work for those who love stories that educate and entertain, for those who seek in fiction a bridge between the past and the future.