Major Pavel Orlov, an employee of the St. Petersburg RUOP, is investigating the activities of a certain real estate agency "Agasfer", involved in apartment fraud. However, the person who was ready to testify dies under mysterious circumstances. Soon a certain native of the southern republics comes to the attention of the police. One after another, he buys and resells apartments, the former owners of which also either die or disappear without a trace. Checking his activities, operatives discover that the threads lead to the same “Agasphere”. And then RUOP officers, under the guise of a housing seller, introduce their employee into the chain...