On the run from the murderer of her best friends, missionary Gracie Benson is all alone in Siberia. What she doesn't know is that she has in her possession a medical secret that will save millions of lives -- or cost hers. Trying to keep her alive is an FSB agent, a man pursued by his own demons, including a killer who destroyed his father's life. He and Gracie find themselves in a decades-old mystery of betrayal and Cold War secrets. Only with the help of their friends -- a group of Americans and Russians committed to freedom -- can they outwit the old guard . . . and save Gracie's secret, as well as her life.