How do you find your missing twin in a top-secret city that doesn’t officially exist, when technically you don’t exist either?

1945: Lillian Kaufman is a brilliant, logic-driven physics student at Columbia University with dreams of securing her place at Harvard. But her world shatters when she receives an unexpected phone call informing her that her glamorous identical twin sister, Eleanor, has mysteriously vanished. Eleanor had recently left New York for a secretive job at an Army base tucked away in the hills of Tennessee.

Determined to uncover the truth, Lillian takes a train down to Oak Ridge—a highly classified city surrounded by barbed wire and strict military checkpoints.

To gain access to the secure compound, Lillian makes a reckless gamble: she assumes Eleanor’s identity, stepping into her missing sister’s life and job. She quickly finds herself thrust into the epicenter of the Manhattan Project—the gravest and most secretive scientific undertaking in human history. Surrounded by machines turning plutonium and uranium, Lillian must navigate a web of lies, classified data, and two of Eleanor’s former lovers. But the longer she pretends to be her twin, the more the lines blur, and the closer she gets to a deadly truth that could destroy them both.How do you find your missing twin in a top-secret city that doesn’t officially exist, when technically you don’t exist either?

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