The Girls of Atomic City by Denise Kiernan
Goodreads summary: " The incredible story of the young women of Oak Ridge, Tennessee, who unwittingly played a crucial role in one of the most significant moments in U.S. history. The Tennessee town of Oak Ridge was created from scratch in 1942. One of the Manhattan Project’s secret cities, it didn’t appear on any maps until 1949, and yet at the height of World War II it was using more electricity than New York City and was home to more than 75,000 people, many of them young women recruited from small towns across the South. Their jobs were shrouded in mystery, but they were buoyed by a sense of shared purpose, close friendships—and a surplus of handsome scientists and Army men! But against this vibrant wartime backdrop, a darker story was unfolding. The penalty for talking about their work—even the most innocuous details—was job loss and eviction. One woman was recruited to spy on her coworkers. They all knew something big was happening at Oak Ridge, but few could ...