Russisch Roulette.

When her young son Nikolai disappears without a trace in the subway, German journalist Katharina Wagner suddenly realizes that she has powerful enemies in St. Petersburg. She has returned to show her child his father's grave – but did her husband Viktor really take his own life, or did he stir up a nest of scorpions that ultimately killed him? Katharina has few allies in her fight for Nikolai, but then it becomes clear who is truly on her side.