January 6, 1980. President of the Sicily Piersanti Mattarella is going to Mass with his family when a young man approaches his car and shoots him in cold blood, killing him. The young Deputy Prosecutor on duty that day is Pietro Grasso, future General Anti-Mafia Prosecutor and President of the Italian Senate. His investigations are continued by Giovanni Falcone, who uncovers dangerous connections between the Mafia, the ruling Christian Democratic Party, neo-fascist terrorists, and secret services.