This book chronicles on a day-to-day basis the astounding story of the discovery of plutonium and the feverish activities to unlock its secrets and enhance its productivity to the levels necessary for the building of an atomic bomb in World War II by its discoverer, Professor Glenn T. Seaborg. Seaborg, who shared the 1951 nobel Prize in Chemistry with his colleague Edwin T. McMillan, was a meticulous diarist whose detailed records of thousands of pages have been edited and supplied with accompanying notes by a trio consisting of a professional scientist with a strong interest in history and two professional historians of science. The work provides not only the step by step description of the scientific activities and the thought processes of Seaborg and his team throughout the war years, but also gives keen insight into the operation of the Manhattan District and of the scientists who played an important role in its functions. Virtually all of the players are identified in the annotations, which also serve to explain the significance of key events and findings as well as obscure or arcane scientific procedures. The professional chemist or nuclear scientist will find this an exciting and compelling saga of a great scientific discovery, carried out in a bygone era of unfettered and productive science that is not likely to occur again. The copious annotations and identifications not only add to the story, but make this a vital and necessary reading and reference source not only for the historian of science, but for those interested in the behind the scenes history of World War II and the Manhattan District.