Three Leaf Clover is the last Grand Theft Auto IV mission from Patrick "Packie" McReary. It involves the two of them robbing the Chinatown Bank of Liberty with Michael and Packie's brother Derrick. Be sure to stock up on health, ammunition and armor before starting. 

• Heed Packie's advice about wearing a smart suit and shoes from Perseus or the mission will not begin.
  
• Head to Packie's to pick up Packie, Michael Keane, and Gerald and Derrick McReary.
• Get a four-door that can fit everyone.
• Follow the GPS to the Southern Algonquin branch of the Bank of Liberty.
• Proceed inside to trigger a cutscene in which all the customers are threatened to get on the floor and the safe is blown open.
• Head downstairs to the vault and pick up the $1 million to trigger another cutscene in which the bank is surrounded by NOOSE and FIB officers.
• Proceed to the exit and begin to work your way out of the five-star wanted level.
• Use your assault rifle to take out some of the cops.
• Run to the alley.
• Take cover and take out a few more cops.
• Proceed down the alley.
• Take cover behind a police car.
• Use the M4 carbine to take out some more cops with headshots.
• Listen to Packie's instructions to continue down the street once the cops are dead.
• Cross the street.
• Fire at any new cops.
• Head through the back streets.
• Take cover against the wall.
• Fire at the new arrivals.
• Continue down the street to the next spot of cover.
• Kill the next batch of cops.
• Get to the end of the street.
• Take cover against the wall.
• Take out the cops near the road block.
• Run across the street and head into the alley to trigger a cutscene that takes you into the subway.
• Proceed to the ticket machine.
• Take out any cops you run into.
• Take cover as much as possible.
• Once you have killed ten or so cops, the coast should be clear to make your way to the platform.
• Go through the gate.
• Pick up the health pack on the pillar.
• Go down the stairs to the platform.
• Take cover against the pillar.
• Take out the cops on the other side of the platform.
• Run into the tunnel.
• Kill the remaining cops.
• Follow Packie and Derrick through the tunnel.
• Leave the tracks.
• Climb up to the platform.
• Enter the doorway.
• Pick up the health pack on the wall.
• Climb the stairs up to street level.
• Hurry to find another car that will transport four. 
• Follow the GPS directions across the bridge.
• Drive through the road block.
• Race across the bridge to ditch your wanted level.
• Hang out for a few to make sure it is gone.
• When you feel safe, continue back to Packie's mother's house.
• Mission completion earns $250,000 and unlocks Taking in the Trash, Actions Speak Louder Than Words, Smackdown, Friendship with Packie, the state of Alderney, "Full Exploration" achievement & Balaclava.