Derrick wants you to track down and kill a guy who is threatening to kill him and his family. The guy's name is Bucky Sligo.
Find a police car, then use the onboard computer to search for "Bucky Sligo". There's actually a couple of cop cars parked just across the street, so break into it and connect to the database. Once you've found him, you'll learn that he's hanging at Burger Shot. Add the destination to your GPS, then make your way there.
Kill 'Em All
Derrick will tell you to make sure you take out Bucky and all of his crew. If he's there alone, he wants you to keep the cop car, and use it to scare Bucky back to his gang so that you can eliminate them all.
Bucky is indeed there alone, so park outside the restaurant and chase him when he leaves. Keep on his tail and follow him back to his buddies.
After a short chase through various peoples back yards, he'll pull up at his house where sure enough, his pals are there to protect him. Pull up behind him and drive-by his ass, then reverse back a bit and get out of your vehicle. Use your car as cover and shoot at the guy in the entrance to the building. Once he's dead, you'll need to move into the house.
Breaking And Entering
Shoot the door open and kill the two or three guys on the bottom floor, then head upstairs and kill the shotgun wielding maniac up there.
Once they're all dead, you'll have a two star wanted level which you need to lose, so get out of the house, grab a car and get out of there. Get a few blocks away and you should have lost them completely.
- After the mission you'll receive a text from Ray unlocking a safehouse in Alderney.
Do everything as usual until you get to Sligo's home. Once there, do not take on his men. Instead, pull out your phone, and call for the police. Once they arrive on the scene, you should try to make Sligo's men shoot at you (you're not shooting back, of course), this will attract the police's attention, and a war between Sligo's men and the police will begin. Once you can get one team of police attacking your targets, the rest is easy, just dial like mad and have about 4-5 police cars show up on the scene. They will join their fellows in battle. All this time, you can just wait in your car, enjoy the war, then once the men are all dead, escape the wanted-ring.
Remember NOT to walk into the house, if you're calling the cops, as supakilla9 tells. I did, and the officers wanted to arrest me :S and then they shot me...