The last mission of the game starts with agent 47 dreaming of the killings of people that he didn't wish to but were ordered. In his vision, he also sees the night Diana's parents were killed by agent 47. After he wakes from his dream he gets himself laid in a bed getting experimented using an injection that will erase agent 47's memories by some doctor.

The main assassination of this mission is Arthur Edwards and the permission of the killing of the providence members.

Change into the doctor's outfit and go ahead you will see a room with a locked panel open the panel by entering the password [1979]. Open the door by using a rusty crowbar, you will see that you are in a running train in frosty weather.

Walkthrough the side of the train then climbs on top of the train obtain the guard's outfit then go straight ahead. While going through the train top be careful of the light posts passing by they can hit you. During this whole train, the mission collect every item you see because it will be useful further. After going through compartments you will find a place where you can craft a silencer for your pistol that you collected earlier from the guards.

There will be three guards in the compartment just nearby. Get out of the compartment, use your silenced pistol to eliminate the three guards then you can go ahead. Then create a distraction by turning off the fuse box, it will lead to a guard coming to check the fuse box take him out to acquire the higher security outfit that will be useful. You will find a passenger key using your instinct vision to obtain it.

After clearing the compartment go through the window that will lead you to a bartending compartment. Climb through the window again you will find a guard sleeping just the next door containing an SMG, it will be useful. Now the SMG will be of use because the guards from now on you are going to face are of much higher level and well-armoured it will take a few headshots to take them down. You can overload light in a fuse cell to temporarily blind some guards so that you a pass by without killing them

Last step towards killing

Now you will enter the second last compartment of the train with professional assassin guards full of the compartment. Acquire their outfit by subduing one. After clearing the compartments you will see a divider separate the compartments from the main compartment now you will be alone 1v1 with Arthur Edwards so that he could not escape his fate. In the end, you can either kill him or spare his life by using the same injection that he was going to give you to erase your memories.