In this classic book, the distinguished science writer Horace Freeland Judson tells the story of the birth and early development of molecular biology in the US, the UK, and France. The fascinating story of the golden period from the revelation of the double helix of DNA to the cracking of the genetic code and first glimpses of gene regulation is told largely in the words of the main players, all of whom Judson interviewed extensively. The result is a book widely regarded as the best history of recent biological science yet published.