The investigations Aiden can take part in are fairly long, but only because these are another form of collectible. Some investigations end in a small mission of their own, but these aren't usually too complicated. There are trophies for each investigation, as well as one for finishing all of them.
The locations of these clue-collectibles and what to do when you've found them all can be found on this page. Please keep in mind that most investigations cannot be finished (unless you try to do it earlier) until you can make the last clues you need to pop up on the map. This occurs after Act 3-1.
Human Traffic
You can start and finish the human trafficking investigation after finishing Act 2-12: A Risky Bid. Each buyer from the auction must be hacked to locate their apartments, which contain briefcases that you have to find. Because the buyers lead to different locations, the identification system on the map matches the chart: Each letter is associated with the number in which it appears chronologically in the alphabet.
All you have to do is hack the phone of a buyer, who won't even run away or anything, then perform a simple intrusion (like a privacy invasion). Just do that ten times and you'll have most of this investigation taken care of.
Joseph DeMarco, the handler for the human trafficking scene, can be found in The Loop after scanning all ten briefcases. After searching his room, you'll find that corrupt cops are preparing to escort him out of town. Kill DeMarco and escape the police to end this crime web once and for all. It may be hard to kill DeMarco without killing police officers, but don't worry about that too much. You get a reputation boost after finishing investigations.
Burner Phones
Maurice Vega's burner phones are scattered all throughout Chicago. You'll pick up one from him at the start of Act 1-1, so there are six more to find before you're able to finish the investigation. All burner phones are easy to find and all you have to do is hack them, so you should have no trouble getting to each phone. You should be aware, however, that the burner phones in Pawnee are not going to appear on your map until you finish Act 3-1.
Finding all eight burner phones ends this investigation.
QR Codes
| Location | Description |
| Parker Square 1 | Cross the street to the west and look for a camera on the northeast corner of a building. |
| Parker Square 2 | Go south down the street and enter a fenced area on the west side. A camera above the southern end of the area can view the QR code. |
| Mad Mile 1 | There's a parking garage (the opening doors face north) west of the fast travel point. When you find yourself in front of the doors, look up above them for a camera. |
| Mad Mile 2 | Look across the street for a little area with tables and chairs. On the corner of a building here is the camera that can scan the code. |
| Mad Mile 3 | This camera is a fair walk away from the QR code itself. It'll be on the corner of a building with the American flag flying to its south. |
| The Loop 1 | Walk into the eastern alley here and use a camera just near the sidewalk. |
| The Loop 2 | Get to the L-Train station southwest of the code and run towards it on the tracks until you can climb on some metal platforms on your right side. Once you've safely made it onto them, look up and to the east for a camera. |
| The Loop 3 | Head to Frewer's shop and swim west across to the western island of The Loop. There's a camera under the highway that can view the code. |
| The Loop 4 | Look to the building west of the L-Train station and check out the camera near the northwest corner of the building. The code is a fair distance away. |
| The Wards 1 | Drive over to the docks and pick up a boat, then park it in the vacant space in front of a closed metal gate in the water. There's a camera on the left that can spot the code, which is south of the camera. |
| The Wards 2 | Walk west a bit towards some brick apartments and look for a circular camera high up, near the middle of the buildings. Use it to look east. |
| Brandon Docks 1 | East of the code is a large warehouse full of boats on blue metal racks. Use a camera on the west side of this warehouse to find the code. |
| Brandon Docks 2 | Look for a nearby L-Train station and use a camera on a building north of it to look west. |
| Brandon Docks 3 | Drive across the bridge to the east and use the camera just on the right side of the road. |
| Brandon Docks 4 | There's a gas station northeast of the code. Head over to it and use a camera on a pole at the southern end of the station. |
| Pawnee 1 | The camera for this code is on the southern side of the unfinished bridge. Hug the west side and use the camera just north of a red metal container. |
QR codes have been hidden on walls and other objects, and can only be scanned correctly if viewed from a certain camera angle. Hacking specific cameras is the only way you'll be able to get the audio logs hidden in each code. The last QR code will not appear on your map until you finish Act 3-1.
DedSec will call you when you've scanned all 16 codes. To test both you and G1gg1L3s, they want you to put a virus into his stuff. Though hacking into his apartment is a bit complex, there's no timer, and it should be fairly simple to unlock certain pieces if you focus on one at a time.
Read-onlyComplete the final mission in the QR Code Investigation
Missing Persons
| Location | Description |
| Parker Square 1 | Run into the tunnel by going between the parked trains. |
| The Loop 1 | Sail to the lighthouse and park your boat by the dock near the hotspot. From the top of the stairs, go north into a gated area, then east towards the small building the body is in. |
| Brandon Docks 1 | This is a very easy body to get to; just drop off the bridge or descend from the bridge's southern end, then walk on up to the body. |
| Brandon Docks 2 | Just walk up some stairs to this one. They weren't even trying to hide it here. |
| Pawnee 1 | This body is in a train car. It's easy to reach once you get to it. |
| Pawnee 2 | The body is inside a shack. You can push an old wooden door to get inside. |
The missing persons investigation can be started immediately. There are six bodies around Chicago that, when scanned, add to the investigation's progress. There are usually audio logs nearby for you to collect, if you're interested. It would be wise to scan the Pawnee bodies last, as the culprit behind it all is located in Pawnee.
Once you're at the little village in Pawnee, look for a woman who suffers from hemophilia and trail her to find the suspect. Knock him down to end the investigation.
Darkness LoomsComplete the final mission of the Missing Persons Investigation
Weapons Trade
| Location | Description |
| Parker Square 1 | Go east across the street and use a camera to look at the top of a building. The access panel to open the garage with the crate is there. |
| Mad Mile 1 | Look west of the garage the weapons are being held in and look upwards across the street toward a camera on a tall white building. Use it to open the garage. |
| Mad Mile 2 | Look on the sides of the building for a ladder to get to the roof. From there, climb onto the side of an angled piece of the roof to get to the very top. You can open the garage from the roof. |
| The Loop 1 | The router for this garage door isn't hard to get to, but it is pretty far away. It'll take about 10-15 seconds of following the signal trail until you find the router. |
| The Loop 2 | Head east down an alley until you get to the sidewalk. There should be a camera around here that can spot the router you need to unlock for this garage door. |
| The Loop 3 | When facing the garage door, look high above it to find the camera required to open the door. |
| The Wards 1 | This router can be spotted from the roof of a nearby building. Simply follow the signal and you'll find it. |
| Brandon Docks 1 | A camera on the northwest corner of the building can let you in. |
| Brandon Docks 2 | Run south of the garage door and look for some stairs leading up. You can find the router to the door after using about two sets of stairs. |
There are nine garages with weapon crates in each one, and they all lead to something suspicious. Each crate is protected by a locked garage door, which you must open by finding the one router connected to it.
After scanning all nine crates and finishing Act 2-6, Frewer will call you to send you the hotspot for all of this criminal activity. The fixers responsible for the weapons trade have taken control of a warehouse. Kill everyone inside, preferably silently, and get ready for backup to arrive. Prepare explosives if you wish, but try to stay on the upper catwalks before the reinforcements spot you. Kill them all and prep for the last wave of fixers. Unfortunately for many, you'll have to clear all three waves of fixers in one go. Dying takes you back to square one.
With this group of fixers out of Chicago's way, unsolved crimes will plummet. Does this affect you very much? No, not really, but you should feel good about yourself.
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