Grace Maxwell is back.
At the close of the Second World War, a Japanese scientist from the infamous Unit 731 is murdered and his work stolen. In the present day, an archeological dig in Mongolia is attacked. Hired to bring the people responsible to justice, Grace Maxwell quickly finds herself trying to piece together clues from the past that will lead to a deadly secret. In a race against time and a dangerous foe, Grace has only her wits and experience to keep her alive. From Mongolia to France, Germany, and Syria, the clock is ticking.