In 1943, twenty-year-old Phyllis Thompson and twenty-two-year-old Dorothy Martinez both answer cryptic job advertisements that promise good wages, housing, and meaningful work for the war effort. What they find is a sprawling government facility surrounded by fences and guards, where secrecy isn't just encouraged, it's enforced by federal law. Along with thousands of other young Americans, they become part of the most classified project in human history, though neither initially understands what they're really building.

Their paths diverge from the beginning. Phyllis, assigned to the massive Y-12 uranium enrichment facility, embraces the routine and applies her chemistry background to analyzing uranium samples with unprecedented precision. Every measurement must be perfect, every batch tested to exacting standards, but no one will tell her why. Dorothy, working at the innovative K-25 gaseous diffusion plant, brings the same technical skills but can't suppress her questions about the broader implications of their work.

When Dorothy's attempts to coordinate safety concerns with her brother (also working on the project at Los Alamos) trigger a security investigation, she faces months of isolation and exile from the work that brought her to Oak Ridge. Meanwhile, Phyllis continues her technical contributions, forming friendships and finding love while maintaining the absolute secrecy that the project demands.

Through alternating chapters, the novella captures the extraordinary daily life of wartime Oak Ridge with vivid detail: the dormitories and cafeterias, the Saturday night dances and weekend trips to Knoxville, the constant tension between burning curiosity and institutional loyalty. The story shows both the camaraderie that developed among workers and the human cost of the security measures that were deemed necessary for the project's success.

When President Truman's voice crackles over the loudspeakers on August 6, 1945, revealing that their work has just destroyed Hiroshima, both women must confront an impossible moral reckoning. The precision they brought to their daily tasks enabled both the end of a devastating war and the dawn of the atomic age, forever changing their understanding of science, duty, and moral responsibility.

The novella concludes with an epilogue tracing Oak Ridge's remarkable transformation from a secret weapons facility to Oak Ridge National Laboratory, today one of the world's premier centers for peaceful scientific research. The same precision and dedication that characterized the wartime effort, combined with the ethical reflection that emerged from questioning its implications, now serves to advance human knowledge, develop clean energy technologies, and heal the environmental scars of the atomic age.

This is ultimately a story of how ordinary people thrust into extraordinary circumstances responded in different ways, some with unquestioning dedication, others with thoughtful resistance... and how both responses proved essential. Behind the Fence serves as both a tribute to the young Americans who worked behind the fence and an exploration of how moral courage and technical precision can serve humanity in different but complementary ways. Perfect for readers who enjoyed *The Wives of Los Alamos*, *The Girls of Atomic City*, or *Code Girls*, this novella offers dual perspectives on one of history's most pivotal moments.