Passenger Without Luggage(2003)

Original title: Пассажир без багажа

Yana and Andrei’s marriage is falling apart. Andrei, a photographer, leaves on a business trip, and she secretly follows him. His body is found in one of the restroom stalls on the St. Petersburg–Moscow train. The investigation suggests that Andrei hanged himself. The question remains: why did a man who seemed to have it all take his own life?