April of 1940. The Arlberg-Orient Express. One night. One meeting in a restaurant car, and after this meeting the lives of three people have changed. Each of them had a bright future ahead of them, but not everything is so simple. Everyone has their own dark secrets. They are brought together by one goal: to possess the diamond necklace of the Russian royal family. What are these three people willing to do to fulfill this goal while the world is divided and the disaster is inexorably approaching?