REWARDS - Respect, C.R.A.S.H. missions unlock
This mission introduces you to some stealth elements. Head towards the blip on the radar to Madd Dogg's house. The main door you need is around the back of the mansion. Go through the door. Sneak behind the first guard, target him, then press Circle to perform a stealth kill. Go into the next room and do the same thing to the patrolling guard. A guard can't see you when you are in dark areas (when your blip on the radar becomes dark).
Go into the next area and you'll see another guard coming. Find a suitable place to hide, which is the first room on the left in the darkness. Wait until he passes and is facing the doorway before going out for the stealth kill. Veer left into the next hallway and you'll be told to crouch past the next guard at the bar and sneak past the next guard at the TV (you can kill the guard at the TV if you want).
Continue to the dark room with armor inside, then go out the other door and stealth kill the last guard. Grab the rhyme book in the next room and then head out of the mansion. Backtrack out of the mansion, killing and stealing any silenced pistols if you want. Once you are out of the mansion, bring the rhyme book to OG to complete the mission.