Falling from the balcony of one of Moscow’s apartment buildings, young woman Ekaterina Averkina was killed. Many neighbors who were in the yard at the time saw how her older sister, Natasha, pushed Katya down. She is arrested immediately. The girl is in shock—during the tragedy she… was walking around Moscow with her young man, Lenar! But it is impossible to prove that: witness testimony invalidates all Natasha’s arguments, and it seems that nothing can help her. However, the Averkina case captures the attention of attorney Vitaly Kirgan and police officer Anton Stashis. During the investigation they discover unexpected facts that ultimately lead them to a shattering solution…