Anna Khitrova (Naomi Watts), a midwife at a London hospital, finds a Russian-language diary on the body of a Tatiana, a fourteen-year-old girl who dies in childbirth. She also finds a card for the Trans-Siberian restaurant, which is owned by Semyon (Armin Mueller-Stahl), a boss in the Russian Mafia or vory v zakone ("thieves in law"). Anna thus sets out to track down the girl\'s family so that she can find a home for the dead mother\'s baby girl. Annas mother Helen (Sinéad Cusack) does not discourage her, but Annas Russian-born uncle Stepan (Jerzy Skolimowski), whom Anna asks for help with translation of the diary, urges caution. Through Semyon and her uncle, Anna comes to learn that Semyon and his unstable son, Kirill (Vincent Cassel), had abused, forced into prostitution, and raped the girl.