Suicide in the midst of a wedding ceremony: the groom douses himself with gasoline, the bride dies in the arms of the guests right in the restaurant of a fashionable hotel. But that’s not all: there have been more and more unexplained deaths among St. Petersburg newlyweds lately. What is behind the new St. Petersburg epidemic and how to prevent further victims? Now this case will be taken up by a group of participants in a psychological experiment - those who have undertaken to prove to themselves that they are capable of becoming a real detective. St. Petersburg tests the strength of any feelings, is it any wonder that the story that began with a wedding “bitterly” will capture more than one couple - everyone who is torn between the fear of being apart and the horror of being together...