Before you start the second chapter of inFamous Paper Trail, make sure that you make all things in the fist chapter. I mean of course completing the third optional mission and examining its trails on site http://infamouspapertrail.com/. Second chapter of inFamous Paper Trail should be unlocked after finishing mission 13a (Flight of Angels) or 13b (Hunting the Hunters). Find a yellow marker on the map and head for it.
You begin the second chapter of inFamous Paper Trail in place shown on the screen above. It's on the bridge connecting the southern and northern Seattle, next to the arena where Delsin fought in the eighth mission (The Test) against an elite DUP agent. Approach the yellow marker and, after connecting with the site, confirm that you want to continue.
You'll chase Celia, a paper rabbit like you, and it works as the similar scene from the first mission of Paper Trail. So you can't lose the chase as Celia will regularly stop and wait for you to keep up. During the chase you should use Neon or Video power, so you don't have a problem of reaching the roofs and crane on the construction site. Chase takes several dozens of seconds and ends nearby the new crime scene in the northern-east Rainier.
Begin from picking up an Origami Dove left by Celia and then jump down. Game won't let you examine the crime scene as there are two groups of DUP soldiers there and you have to get rid of them. You have be very careful as Delsin encounter here many enemies with power and one also with a minigun. Consider attacking enemies from roofs with your most powerful attacks (R1 button).
Return to the crime scene when the vicinity is clear. Stand where the game show you to and press Up to start making photos. You have to photograph three objects (use the bar at the bottom to find them) and then take three items: Note, Phone and Key Fob.
Now you just need to get to the place where you sent the proofs. It's in the center of Waterfront.