This book tells the incredible true story of four brilliant Black women—Dorothy Vaughan, Mary Jackson, Katherine Johnson, and Christine Darden—who worked as mathematicians at NASA during the Space Race. Using their exceptional skills in math and engineering, they calculated the flight paths that launched astronauts into space and helped America win the race to the moon. The book follows their journey as they overcome both racial segregation and gender discrimination at work. It's a powerful story about hidden heroes, perseverance, and the triumph of intelligence and courage.