An unknown virus is destroying Y chromosomes, causing a complete collapse in male births. As the crisis intensifies, Emma, ​​a leading scientist, becomes a beacon of hope, defying convention and fighting for the perpetuation of the species. Her journey is an odyssey of courage and determination, where every decision could mean the difference between salvation and extinction. With a literary style that blends tension and reflection, this novel explores not only the limits of science but also the complexities of human morality in times of crisis. A must-read that invites reflection on the future of our species.