Ep 1. Episode 1

On her first day in the criminal investigation office, Maria Krapivina finger-prints a thief called Buffet who was arrested during the attempted robbery of a jewelry store. During the interrogation, Buffet attacks Masha and whispers to her that there's a traitor in the police. The next day, the criminals try to rescue Buffet during a prisoner transfer and Shvedov saves Masha's life.