New Year's holidays turned into a real nightmare for Washington: a pair of killers who arrived in the city shot passengers in the city metro. And soon the mayor of the capital receives a handwritten letter: if the criminals are not paid a huge ransom, the massacres will continue. Time is running out. Soon the killers will go hunting again. Experienced FBI agent Margaret Lucas, who is entrusted with the investigation, decides to recruit a leading expert in the psychological analysis of handwritten texts...