Darker Than Night by John Lutz is $1.99 at Amazon US.
I've read and enjoyed a few of his books, though I haven't read this one yet.
Quote:
A killer dubbed "The Night Prowler" has turned the city that doesn't sleep into a town kept awake by terror. Unseen, he enters couples' homes. Unsuspected, he lingers until the perfect moment arrives. He leaves "gifts" for his victims--before taking their lives.
Enter ex-homicide cop Frank Quinn, still reeling in the wake of an elaborate setup that ended his career. For Quinn, this isn't just any job--it's a last chance to salvage his reputation. As the investigation proceeds, the murderer loses no time stalking new prey: a loan officer and her high-earning husband; a couple who made a killing in the stock market; a pretty actress and her prosperous lover.
With the body count rising, it's up to Quinn to unlock the mystery of a madman's past and end his bloody reign. Quinn's got his work cut out--because in a city the size of New York, any one of 8 million faces could be that of a killer--or his next target. . .
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