There is a rumour that your friend has been killed by mafia. and you would like to find out, it is true or not.
But you have to be aware too, that you just know that the mafia is chasing you now.
Kill all the mafia who is trying to kill you. and drive the car until you find the leader of mafia, and kill him.
You have limited bullets, but you can restock it when you are in shop.