A change of plans

You are not fifty feet from the automatic doors of the Research wing when they slide open. Taking no chances, you dive behind a parked car, heart racing. You slowly peek through the back window of the sedan and, to your horror, you see Brooke being led to another building by three figures in lab coats. Following the group are two security guards in full riot gear; no way you'll be able to sneak up and get Brooke out of there.

At this point, you decide that you have to follow them, so you slowly round the front of the car and keep back about two hundred feet, staying behind the row of parked cars.

Just before you run out of cars to use as cover, the procession turns left around the side of the building. You wait a beat and follow, taking care not to be seen. You lean around the corner and see the group descending a staircase. An underground area?

You approach the steps and see a sign reading "RESTRICTED: AUTHORIZED RESEARCH AND SECURITY PERSONNEL ONLY." It seems that the door is only just swinging shut, so you jump down the short flight of stairs and slip inside.

What have I gotten into, you think as you take in the bleached white hallways and sterile smell.