The correspondence of the Nobel Prize winning scientist, Dorothy Hodgkin (1910-1994), introduced by her biographer, Georgina Ferry. In the early 1930s, Dorothy embraced x-ray crystallography, working with her phD supervisor and lover, J.D. Bernal. Letters that were both scientific and highly personal flew back and forth between them, as they tried to determine the internal structure of complex molecules. Producer: Anna Buckley.