Few would suspect a young widow and mother of two small children of being a spy. Fewer still would believe she leads the largest intelligence operation in France.

Marseille, France, 1941. Zelie Bellerose never fit the mold of an army officer’s wife. She was too passionate in her convictions, too indifferent to societal expectations. After her husband is killed in the war, Zelie focuses on securing a brighter future for her children, hoping to help free her country from the Nazi regime by joining the Resistance. She is soon one of the most trusted operatives in Alliance, and when their leader is imprisoned, she takes command, hiding her identity from all but a few. With enemies closing in, Zelie must earn the trust of her network and prove herself to those who doubt a woman’s place at the helm of France’s largest spy ring.

Marcel Laurent was a renowned concert pianist before joining the French army and being sent to a POW camp. Freed in a prisoner exchange by a wealthy businessman with ties to the Resistance, Marcel agrees to spy for Alliance by conducting a youth orchestra, gathering intelligence from patrons who are loose-lipped Nazi sympathizers. Marcel’s weekly radio broadcasts introducing the orchestra’s performances give him the perfect cover to send coded messages over the airwaves.

As Zelie and Marcel grow closer through their shared love of music, she begins to rely on him. But betrayal from within Alliance puts everything they’ve fought for at risk. When a double agent infiltrates their ranks and the two are captured, their bond faces its greatest test . . . and any misstep could jeopardize not only Alliance but the very outcome of the war.