As a volunteer for the ambulance service, Ruby has the dangerous task of driving along pitch-dark roads during the blackout. With each survivor she pulls from the rubble, she is helping to fight back against the enemy bombers, who leave nothing but destruction in their wake. She's assigned to work with Joseph, who will stop at nothing to save innocent victims of war. Because he is not in uniform, people treat him with suspicion. But as Ruby watches him save a young child from a building that may collapse at any moment, she becomes determined to protect this brave, compassionate man. Even if it means making an unthinkable choice between saving her own life and risking everything for his... 2019: Recently divorced Edi feels lost and alone when she moves to London to start a new life. Until she makes a discovery, hidden beneath a loose floorboard in her attic, that reveals the story of the woman who lived there in the 1940s. She gradually pieces together a life full of danger, love and betrayal and becomes inspired by Ruby's heroism. But as Edi uncovers more about Ruby, she realises that the house holds the key to a devastating wartime secret and that the truth can be a dangerous thing...