The discovery of DNA is often told as a triumph of genius but rarely as a story of exclusion. Behind the double helix stood a scientist whose work made the breakthrough possible, yet whose name was pushed to the margins of history. Rosalind Franklin's photographs revealed the structure of life itself. Her precision, rigor, and intellectual honesty shaped one of the greatest scientific discoveries of the twentieth century, while credit flowed elsewhere. This is not a story of bitterness, but of truth: how brilliance can be overlooked when power, ego, and bias intervene. The Hidden Helix traces Franklin's life and work with clarity and restraint, from her mastery of X-ray crystallography to the quiet circumstances under which her data reshaped biology. It examines the culture of mid-century science, the ethical failures surrounding recognition, and the long shadow cast by a discovery that changed medicine, genetics, and humanity's understanding of itself. This book restores Franklin not as a footnote, but as a central figure in one of science's defining moments. For readers who value accuracy over mythology and justice over convenience, this is the story that completes the history of DNA.