This page of the Marvel's Spider-Man Game Guide provides a description of Uninvited mission. MJ again takes things into her own hands and tries to invade the heavily guarded base of Sable agents.
It's time for another stealth mission. Go straight ahead, press L2 and use the gadget to distract the guard. Then go under the gate and turn left.
Go to the next guard and throw the lure to move him away from the stairs. When the passage is safe, run upward and take a photo of the screen.
Now go down and get into the engine. Turn it on and when the Sable mercenary goes to see what happened, run into the tent. Go behind the back of the second guard and turn right, to leave the tent.
Go up to the toolbox and drop it down. Then go on through the container.
Go up to the moving truck and wait for it to start. Take the right side to protect yourself from the sight of the Sable soldiers.
Go up the stairs and drop the next toolbox. Then go left (watch out for the boxes!) and position yourself near the guard by the stairs.
Distract the guard with the help of the sensor and go down the stairs. Beware of the previous guard - wait for the moment when he will look in the other direction, or use the second lure to also distract his attention.
Go down the stairs and take another photo. Now approach the generator and turn off the lights.
Go right, through the building and pass the trucks on the right.
Turn the guard's attention away from the tent and then go on the right side of the truck and enter the gap in the fence on the right side.
Pass the building on the right and approach the yellow marker. Distract the attention of the last guard and enter the tent. MJ will get some valuable information. The mission will be successful. Reward: 3000 XP.