A reconstruction of eight double murders believed to have been committed by one man between 1968 and 1985 in and around Florence, Italy. The still unsolved case of "The Monster," the nickname given to the alleged serial killer who targeted couples parked in cars in remote locations around Florence. "The Monster" always used the same weapon, a .22 Beretta. The cold case marks one of the longest investigations into the most brutal serial killings in Italian history.