In the midst of World War II's turmoil, the quaint British town of Bury St. Edmonds becomes a focal point where lives intersect and secrets unravel. An 18-year-old woman, finds herself caught in the throes of a great wartime secret – the breaking of the German Enigma code. Her recruitment into the "Ultra" program brings her to the heart of Bletchley Park's most clandestine operations, where Alan Turing and his team forge the world's first computer in a bid to crack the ever-changing German codes. Every day, she grapples with the weight of the secret, which is so profound that even her family is oblivious to her covert role. Meanwhile, amidst the dances and interactions in the town, she captures the heart of an assertive American soldier. Their whirlwind wartime romance culminates in a heartwarming union, facing the challenges of the Official Secrets Act that surrounds her duty. The soldier, persistent and deeply in love, goes to great lengths, even penning letters to officials, in order to secure her release from the program and to solidify their commitment to one another. They eventually marry and cross the Atlantic to build a new life in the US, where they raise children who, years later, come to discover the incredible stories of their parents' contributions during the tumultuous war years.