Keep following waypoints until you get to the bookstore. Stay outside and try to clear out the bottom floor before heading upstairs and clearing the enemies up there. Head back down and exit through the back door of the Bookstore. Follow some more waypoints to meet up with the GIGN squad. Head through the dining room of the restaurant and in the alley, watch for an influx of enemies from your left. Kill as many as you can before they get to cover and then take out the RPG. Clean up whatever is left and head up the stairs.
Follow a few more waypoints until you find a packed alley. Throw a purple smoke grenade into the alley (aim for the truck) and you'll get some air support to clear it out for you. Turn right and climb the stairs, get rid of anew enemies in the street and get ready to pop more smoke. You'll see a Tacoma down the street in front of you. Throw the smoke down the street. Get rid of a stragglers and head into the sewers.
For a good portion of the sewers, you are just following and talking but eventually things will get bad and you'll have to take out a few enemies. Head up the stairs and round the corner, watch the flash bang and then you'll have to race to catch Volk. Kill enemies as quickly as possible but don't get yourself killed. Chase him out of the sewers and up into the streets. Get in the van.
While riding in the van, you'll move to the back and have to fend off a few infantry. Grab the LMG in the back and unload on the enemies since there is likely too much smoke to see clearly. Throughout the ride, the biggest threat will be the jeeps chasing after you. Whenever you see one, just unload at the gunner until he stops shooting. After a handful of jeeps and being chased bay chopper, you'll have to switch to shotgun. Once there, shoot out one of the tires of the car and when you slam into it, kill the man on the roof and in the back seat.
