The richest man in a provincial town died under mysterious circumstances. A heart attack is the doctor’s diagnosis. But why is there a mask of horror on the face of the deceased? What did he see before his death? The young journalist begins her own investigation and quickly understands that everyone with whom the businessman communicated is a suspect. But who is the killer? Heirs? Competitors? Personal enemies? Too beautiful and young wife? And most importantly, how did the killer manage to commit the crime?..