The Face of Fear - Dean Kootz

DON'T LOOK DOWN
Because you're trapped. With a beautiful, terrified woman. On the 40th floor of a deserted office building. By the psyshopath they call "The Butcher."
DON'T LOOK DOWN
Because you're an ex-mountain climber. Because a fall from Everest left you with a bad leg... and a paralyzing fear of heights.
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.