Three generations struggle in this suspenseful and compelling saga, which begins in 1912, Kent, England, and ends during the 1936-39 Spanish Civil War. After fleeing from an abusive husband accused of murder, Celia Merrill becomes embroiled in a Spanish Civil War. Celia’s two sons march under opposing banners, whilst her twin daughters take different paths; one to the Catholic Church and the other to the battlefields. And in the shadow of war, a sinister villain from the past resurfaces.

Brinley Knight has a photographic memory. Bored with his mundane job, he accepts an offer from MI5 to become a full-time spy in a shadowy world of espionage. As Britain stands at the edge of war, Brin learns to his cost that "defending the realm" means duty before family. Hitler’s fifth columnists in Britain emerge from the darkness as Germany’s military might eyes new territories east of the Rhine. German spies and fascists operate in opulent dining rooms and in the back alleys of London’s East End. Menacing predators, they hunt for information that could aid the Führer.

Dieter Vogel, a German industrialist, believes in protecting his family at all costs, but in a bid to keep his English wife and children safe, he is plunged into a well of deceit that tears the family apart. Doctor Paul Vogel is coerced into working in the Nazi eugenics program and soon discovers that sterilizing handicapped and mentally-ill Germans is just a prelude to a more lethal plan against those the Reich deem unworthy of life. Paul, trapped by the SS, seeks help from the unlikeliest of people and is plunged into a world of espionage and murder.

January 1944—a senior member of the French Resistance betrays his comrades to the Abwehr and Gestapo, but who? Within hours, the Germans arrest hundreds of suspected resistance fighters and incarcerate them in the infamous Amiens prison. When a Resistance spy inside the prison informs his leaders, Dominique Ponchardier and Boniface Monier, of German plans to conduct mass executions within weeks, they are helpless to respond. In a last-ditch effort to free their Résistants awaiting death or deportation to labor camps, they turn to the British for help.

When unimaginable calamities strike, Mercy Carver, a poor London woman, wonders what she has done to deserve such immeasurable suffering. It is only when she faces imminent death in the snow and ice-encrusted Virginia wilderness that she finally understands the power of destiny. Mercy is passionate. She loves and hates in equal measure. Can love and hatred give her the strength she needs now to reach a Northern state and free a runaway slave wanted for murders she committed?