From the author of the acclaimed international bestseller The Long Flight Home, comes a riveting World War II-era story of courage and daring, as a young woman is drafted into Churchill's overseas spy network.

London, 1941: In a cramped bunker in Winston Churchill's Cabinet War Rooms, underneath Westminster's Treasury building, civilian women huddle at desks, typing up confidential documents and reports. Since her parents were killed in a bombing raid, Rose Teasdale has spent more hours than usual in Room 60, working double shifts, growing accustomed to the burnt scent of the Prime Minister's cigars permeating the stale air. Winning the war is the only thing that matters, and she will gladly do her part. And when Rose's fluency in French comes to the attention of Churchill himself, it brings a rare yet dangerous opportunity.

Rose is recruited for the Special Operations Executive, a secret British organization that conducts espionage in Nazi-occupied Europe. After weeks of grueling training, Rose parachutes into France with a new codename: Dragonfly. Posing as a cosmetics saleswoman in Paris, she ferries messages to and from the Resistance, knowing that the slightest misstep means capture or death.

Soon Rose is assigned to a new mission with Lazare Aron, a French Resistance fighter who has watched his beloved Paris become a shell of itself, with desolate streets and buildings draped in Swastikas. Since his parents were sent to a German work camp, Lazare has dedicated himself to the cause with the same fervor as Rose. Yet Rose's very loyalty brings risks as she undertakes a high-stakes prison raid, and discovers how much she may have to sacrifice to justify Churchill's faith in her...