A Soviet officer serves as a counterspy amidst enemies.

A classic mystery story based on Arkadi Adamov novels. A task force is investigating a series of routine thefts at hotels. Upon closer examination of the case, young criminal investigator Vitaly Losev unexpectedly uncovers major players in the shadow economy who were involved in speculation and theft of state property.

The film raises acute issues in construction, where, back in the 1970s, all the social shortcomings of large-scale but short-term production projects were concentrated: premature completion of projects, mismanagement, weak control, theft, and fraud.

The film shows the daily life of an architecture studio, where a young student comes to work on his dissertation.