A Trans-Siberian train journey from China to Moscow becomes a thrilling chase of deception and murder when an American couple encounters a mysterious pair of fellow travelers.

Catherine is a woman in her late twenties who is strongly devoted to her father, Robert, a brilliant and well-known mathematician whose grip on reality is beginning to slip away….

A witty, romantic, and very dangerous love story about chance meetings, instant attractions, and casual betrayals. Two couples disintegrate when they begin destructive adulterous affairs with each other.