You're working late in your office building. You're a computer admin, an ambitious junior executive, a security guard, part of the cleaning crew, or just an average Joe who doesn't want to go home. The lights on your floor go out. In the seconds before the emergency lighting comes on, you hear an agonized scream that ends abruptly. Maybe it's time to go. The elevators aren't working. There's blood on the stairs. How will you get out alive?