Dinah Kendall's role in the US capital for the Office of Strategic Services is far from the thrilling espionage career she dreamed of. Instead of covert missions, she crafts rumors aimed at undermining Axis morale while trying to live up to the expectations of her demanding mother, Lillian. Yet, as Dinah navigates her duties, she uncovers a startling revelation: Lillian was once a codebreaker, breaking military ciphers during the Great War alongside some of the nation's most brilliant minds. The deeper Dinah dives into her mother's journal, the more the secrets of the past come to light—including the heavy cost of high-stakes codebreaking.

Lillian, resolute in her decision to avoid war work, finds herself reluctantly drawn back into the fray when old acquaintances in Washington, DC, seek her expertise. Even Dinah seeks her out, and the two must overcome their differences to work on an OSS cipher campaign to support Allied spies overseas. But just when Dinah begins to excel in her new position, she is implicated in a series of suspicious activities that cause others to question her loyalty. As she navigates a web of intrigue, she must piece together the truth in time to confront the shadowy threat that could compromise the impending D-Day invasion.

Award-winning author Amy Lynn Green presents a tale of daring, danger, and the bond between mother and daughter, based on real experiences of World War II OSS agents and World War I codebreakers.