Who and why needed to cruelly and calculatedly eliminate four girls who had been friends since their youth from their path? Poisoned by mushrooms, she dies alone at the festive table. Another burns alive in her own apartment. The third almost dies in a car accident, and the fourth is being pursued by a murderous maniac... Who is he? Where to look for his traces? In the present or in the distant past, when the four were enthusiastically involved in parachuting and the main thing in their lives was a passion for risky jumps?..