A small group of women, covert agents during WWII, kept quiet for decades by the Official Secrets Act, finally confront and uncover the betrayal behind the wartime death of a fellow agent.

Working for the British Special Operations Executive during WWII, four women became bonded through triumph and tragedy, training to deploy undercover in France—but on a final, fateful mission, the effervescent and enigmatic group leader, Gabrielle, died.

Twenty years later, amid the rush and wildness of the 60s, the extraordinary work done by women in the war is coming to light. When the sudden death of a leading war historian and a mysterious letter push Gabrielle's daughter to investigate what really happened, she has to team up with her mother's old comrades.

Once united by the war, these three women's lives couldn’t be more different. Flip, a Southern Belle with a prosthetic leg, is now married and well off, while Zaina, an Indian Londoner and former wireless operator, writes popular children’s books; and the fabulous Bella left behind her expertise in explosives for fiery love affairs as an iconic dancer and singer. Together, all four women discover dangerous secrets that threaten their friendship and reveal a conspiracy that might just go all the way to the top of the war office…