Little Sister

You've traced Nicky's position and it's time to get her back. Head to the security router and hack it. Once you've found Nicky in the camera feed, switch to the laptop camera and blow up the junction box behind the fixer. Hack the guard's phone afterward.

You're supposed to guide Nicky through the series of guards. Take note that you can also cancel out the camera view and just take care of the guards yourself. From the security router, go to the left and you'll find some pallets and container van that you can climb on. Use a ctOS scan to tag enemies and know the direction they're looking. There should be one guard patrolling near that area so make sure to take him out when you're behind him.

From that platform, you can snipe enemies safely. They won't know your position as long as you don't let them see you. Once all enemies are killed, Nicky will be able to get to the car. Escape the area to complete the mission.