In March 1953, Maurice Wilkins of King's College, London, announced the departure of his obstructive colleague Rosalind Franklin to rival Cavendish Laboratory scientist Francis Crick. But it was too late. Franklin's unpublished data and crucial photograph of DNA had already been seen by her competitors at the Cambridge University lab. With the aid of these, plus their own knowledge, Watson and Crick discovered the structure of the molecule that genes are composed of -- DNA, the secret of life. Five years later, at the age of thirty-seven, after more brilliant research under J. D. Bernal at Birkbeck College, Rosalind died of ovarian cancer. In 1962, Wilkins, Crick and Watson were awarded the Nobel Prize for their elucidation of DNA's structure. Franklin's part was forgotten until she was caricatured in Watson's book The Double Helix. In this full and balanced biography, Brenda Maddox has been given unique access to Franklin's personal correspondence and has interviewed all the principal scientists involved, including Crick, Watson and Wilkins. This is a powerful story, told by one of the finest biographers, of a remarkably single-minded, forthright and tempestuous young woman who, at the age of fifteen, decided she was going to be a scientist, but who was airbrushed out of the greatest scientific discovery of the twentieth century.