Kiernan (Signing Their Lives Away) writes compellingly of the women who toiled in Oak Ridge, Tennessee, during World War II as part of the Manhattan Project to build the atomic bomb. Living and working with thousands of others in a secret city built almost overnight, those involved in the "Project" were unaware that they were contributing to the most revolutionary scientific discovery of the 20th century. Moving between the individual narratives of the women workers and the story of the development of atomic fusion, Kiernan emphasizes the secretive nature of the work yet gives readers a greater understanding of the larger historical context. The endnotes provide comprehensive information about primary sources consulted as well as oral interviews Kiernan undertook with surviving workers. However, no complete bibliography is included. VERDICT This work complements Russell Olwell's At Work in the Atomic City: A Labor and Social History of Oak Ridge, Tennessee. Kiernan capably captures the spirit of women's wartime opportunities and their sacrifices in what is ultimately a captivating narrative. Recommended reading for popular history fans.—Kathryn Wells, Fitchburg State Univ. Lib., MA