A young successful businessman Pavel Gorelov dies under the rubble of a collapsed balcony of an old building. The police are leaning towards the version of an accident - the building, past which the businessman usually passed in the evenings, is dilapidated, has long been occupied and is being prepared for demolition. But Inna, the sister of the deceased, is sure that her brother was the victim of an intelligent, cruel killer. There are more than enough suspects: competitors, partners, fired employees, the wife - the main heir of the deceased. Wanting to get to the bottom of the truth, Inna hires private detective Sergei Soshnikov...