Chapter 4
Once you have spoken to Sinomoi you will need to make your way out and look for the chopper, you will also encounter the suicider! You will need to watch out for this guy, If you have the blue print for the deo-bomb.
Carry on and make your way across the lagoon and find Nikolai, after you have spoke to Nik, you will need to follow him and take on all those zombies as you will find Nik is quite a lazy guy!
After you have taken Nik to the safe-house, you will need to make your way back to Sinomoi and he will give you another quest, once you have accepted the quest, head down into the car and drive towards the marker.
Even though the game tells you to get out of the car, you will be able to use the car to run them down which is a lot easier!
Once you have made your way to the marker and make your way inside to Earl., you will need to defend the door for Earl, you will die a couple of times, but for the amounts of zombies I think you can handle a couple of deaths!