As the adventure begins you become Kyle Crane, the secret agent for an NGO (Non-Government Organization) known as the GRE - a do-gooder outfit that was working on a cure for the epidemic that has turned the occupants of this city into zombie-like infected things.
Jumping from a cargo plane flying over the city of Harran you parachute down but in the midst of a rather rough landing end up being temporarily accosted by Bandits.
While the Bandits are deciding what to do with you a group of infected attack - scattering them and biting you - but you are rescued by a different group of survivors (the good guys) and thus are not killed or crippled by the Bandits or the infested.
You awaken in the relative safety of the Safe House of the Survivors, which is called The Tower, and you begin meeting your saviors.
To all appearances you seem to be something of a screw-up, at least to their point-of-view, however after you get your radio back it becomes evident that you are right where you wanted to be. In other words you are not as big a screw-up as you are appearing to be.
As you explore The Tower you learn about Survivor Vision, gathering resources, and when you encounter an injured Survivor, basic first-aid for injuries.
On The Roof - Parkour Training
Once you settle into your assigned quarters and change clothes you are called to the roof of The Tower by Rahim, who appears to be one of the junior leaders. He explains that he wants to see what your abilities are, and then proceeds to goad you into making a long jump off of the edge of The Tower onto a pile of trash - which teaches you that you can do that and survive without injury (if you do it right).
After the jump you end up in an adjacent tower, as Rahim begins what amounts to Basic Survival Training in the Quarantine Zone.
You learn basic Parkour - running, jumping, crawling, climbing, and the like. As he guides you through the course via your radio, you learn the basic commands and controls.
Basic Commands and Controls
As you make your way to the other side of the course Rahim ends up being very impressed by your progress and skills - especially when you tell him you have no previous Parkour training!
As you approach the end of the course something goes wonky with your vision and you start to freak out - but Rahim is not too worried, and tells you to head back to the base to get a shot. He doesn't think you are turning, you are just showing symptoms is all. Well, that may not seem like a big deal to him, but it gets you pretty upset!
As you make your way back to The Tower you enter the Slums, and during the CS your monologue sets up this first mission...
Collectibles
As you proceeded to this point when you were searching for resources earlier you should have found the following Collections Items:
1. Note #05 - On the Bulletin Board.
2. Marvin Zucker's Battle Journal Entry #0 - On the Shelves near the Quartermaster.
At this point you should have unlocked the following Achievements:
Is It Really Necessary? (5g) Kill your first infected.
Little Craftsman (10g) Craft your first item.
Flight of the Crane (10g) Jump from the Crane.