What could be better than “The Cozy Detective”, in which the friendship of three detective friends helps to unravel even the most complex case. The end of the hot summer, detectives Miroslava and Maurice enjoy the warmth, the dacha and the opera, but soon they will have to come to the rescue of their friend to investigator Shura Napoleonov, who has reached a dead end with yet another case. A woman dies in her own apartment, leaving behind a considerable inheritance. The main suspect becomes her adopted son - an inattentive, indifferent spendthrift, accustomed to living at her expense. The problem is that he has an alibi. But is it really so certain? In addition, it turns out that a special will was left... However, all those interviewed have an alibi and no motive, and it begins to seem that the killer is elusive. Miroslava and Maurice decide to help shed light on this dark story...