This special book is a compilation of essays on a remarkable but little-known story that lasted over half a century of world-renowned physicist, the late Sir Rudolf Peierls and his wife Genia Kannegiser. Peierls collected a lot of prestigious awards in his lifetime, and in the beginning of WW2, he and Otto Frisch were responsible for the inception of the Anglo-American nuclear program (1940). He was also one of the key contributors in the research at Los Alamos during those turbulent times.Most previous books on Peierls have focused on his scientific research, while the contents for this volume sheds light on his private life in dramatic circumstances. The extensive contributions were not only gathered from the relatives of Genia, the couple's daughters, Landau's students, and from Russian and English archives, but they also include the unique perspectives of the author who is a professional theoretical physicist and is also fluent in Russian, his native language.So, this fascinating story of love, friendship and physics between Rudolf and Genia is being told for the first time from a surprisingly new angle through correspondence between Genia and Rudolf, memoirs and other documents, interesting and informal excerpts from Peierls' private 'diary' covering the years 1979-1994 that will take the reader on a journey through communism, world war, the trials and tribulations of the loving couple with distinctly very different personalities.