It has been a long time since I read this book and I don't really remember it. Here is the blurb fromthe back of the book to give you an idea what it is about:
Kara Wald thought she knew her sister Kelly. She was practical, down-to-earth, and just a little bit dull. But then Kelly died after jumping - or being pushed - out of a twelfth-floor window of Manhattan's Plaza Hotel - wearing only a black garter belt and black stockings. And after having sex with two men.
How could this have happened? Kara uncovers a bizarre and twisted world of sadistic sex and decadent violence - and something worse. Something strage and evil in her sister's past that she must conquer. Because as Kara herself slips into the kinky and dangerous world that killed Kelly, she realizes that it's coming after her.