In 1944, American naval officer Lt. Wyatt Paxton arrives in London to prepare for the Allied invasion of France. He works closely with Dorothy Fairfax, a "Wren" in the Women's Royal Naval Service. Dorothy pieces together reconnaissance photographs with thousands of holiday snapshots of France--including those of her own family's summer home--in order to create accurate maps of Normandy. Maps that Wyatt will turn into naval bombardment plans. As the...