The story of the gene begins in an obscure Augustinian abbey in Moravia in 1856 where a monk stumbles on the idea of a ‘unit of heredity’. It intersects with Darwin’s theory of evolution, and collides with the horrors of Nazi eugenics in the 1940s. The gene transforms post-war biology. It reorganises our understanding of sexuality, temperament, choice and free will. This is a story driven by human ingenuity and obsessive minds – from Charles Darwin and Gregor Mendel to Francis Crick, James Watson and Rosalind Franklin, and the thousands of scientists still working to understand the code of codes. Woven through The Gene, like a red line, is also an intimate history – the story of Mukherjee’s own family and its recurring pattern of mental illness, reminding us that genetics is vitally relevant to everyday lives. The cancer physician’s book The Emperor of All Maladies: A Biography of Cancer won the Pulitzer Prize. Chaired by Claire Armitstead.