Playable

A veteran of the Balkan wars who arrives in Liberty City on his cousin's promise of a mansion and finds a cab office and a debt. He stays because the man who sold out his unit is somewhere in the city.
All 90 missions · 2 as giver
GTA IV
66of 90
Mission 66 of 90Story mission
The diamonds are to be sold at the Libertonian museum, and everybody involved has brought somebody who intends to leave with both the money and the stones. Niko goes in with Johnny Klebitz; Luis Lopez is upstairs on Gay Tony's behalf; Isaac Roth's crew are already in position.
It is the mission where GTA IV and both its episodes occupy the same room — the same shootout is playable from three sides across three games — and none of the three parties gets what they came for.
The deal collapses on the upper level. Clear everybody on Niko's own floor before doing anything else, then use the railing to shoot down at the ones on the ground.
Men come up them, and they arrive quickly. There is body armour on a small desk in this stretch worth taking.
Going down means clearing it again from below, and it is still possible to be shot at from the upper level while doing it. The way on is the exit on the far side of the room, through the white doors and then left.
Take cover by the wall. Isaac's men are behind the cars in front of the museum, and the ones who break away have to be finished too. There are health packs near the exit.
A wanted level follows the fight. Taking a car and driving out is a legitimate alternative to killing everybody outside, and the mission ends when the level is clear.
Who this mission brings together, and the ground it covers.
Playable

A veteran of the Balkan wars who arrives in Liberty City on his cousin's promise of a mansion and finds a cab office and a debt. He stays because the man who sold out his unit is somewhere in the city.
All 90 missions · 2 as giver
Gives the job

A Pegorino family capo whose diamond deal drags Niko, Johnny and half of Liberty City into the same disaster from three directions.
10 of 90 missions · 7 as giver