Fleet Hall Theater

Hack the camera here to be on the safe side, then head up the stairs to the storage area of the theater to meet up with Sander Cohen for the first time. He won't have much to say to you, so return to the foyer and use the call button next to the elevator to bring it up to your level. You'll wind up overlooking the stage of the theater at this point, where a young Splicer is being forced to play a piano that's been rigged with explosives. He's dead whether you watch or not, so feel free to shoot...

Peaches The Betrayal

Unsurprisingly, Peaches will turn on you after you enter his little icebox. You don't have any weapons with which to defend yourself, so you'll have to rely on hacking and plasmids in order to do the job for you. To begin with, move off to the right and find the security camera there hack it to bring in a security bot to help you out during the fight. Then, find the healing station in the middle of the room and hack that as well. There's also a turret on the northern side of the arena, but...