A riveting story of one woman's courage and perseverance, set against the backdrop of World War Two.

1940. Clever and fiercely loyal Ena Dudley is working in a factory in Lowarth, England at the height of the war, living with the ever-present dangers of her job and the constant threat of air raids. When she's charged with delivering vital equipment to Bletchley Park - the heart of the British wartime intelligence operation - Ena rises to the challenge, setting off with her best friend Freda, determined to do her bit to help the war effort.

But what should have been a simple errand quickly turns into a nightmare. After being drugged and robbed by a stranger on the train to Bletchley, Ena finds herself in grave danger, under suspicion by the very people she was trying to help and unsure who she can trust.

With her closest friends accused of being involved, and haunted by the robbery and the possibility she's been betrayed, Ena finds solace in a growing friendship with her co-worker Henry - but falling in love comes at a cost. Torn between loyalty to her family and desire to be with the man she loves, Ena sets out to discover the truth of what happened and prove her innocence.

This is a thrilling and inspiring testament to the human spirit, which vividly captures the drama and the intrigue of working at historic Bletchley Park. For fans of Before We Were Yours, The Lilac Sisters and Diney Costeloe.