The killer is an expert. He has climbed ten stories in the Manhattan blackout, found and dispatched his victim amidst the men and women trapped in the building. The night drags on. Nerves wear thin and inhibitions disappear. Anyone, including a beautiful secretary with a yen for eye-patched detective Tim Corrigan, could be the lurking killer.
Used availability for Richard Deming's What's in the Dark?
August 1985 : USA Mass Market Paperback