The Face of Fear — Dean Koontz

DON'T LOOK DOWN

Because you're trapped. With a beautiful, terrified woman. On the 40th floor of a deserted office building. By the psychopath they call "The Butcher."

DON'T LOOK DOWN

Because he has slaughtered the guards and short-circuited the elevators. Because the stairways are blocked, and for you and the woman with you, there's only one escape route.

DON'T LOOK DOWN

Because 600 feet of empty space are looking back at you.