The Hellbound Heart by Clive Barker

Clive Barker is widely acknowledged as the master of nerve-shattering horror. The Hellbound Heart is one of his best, one of the most dead-frightening stories you are likely to ever read, a story of the human heart and all the great terrors and ecstasies within.
At last he had solved the puzzle of Lemarchand's box. He was standing on the threshold of a world of heightened sensations. In moments the Cenobites - who had dedicated an eternity to the pursuit of sensuality - would be here. They would reveal dark secrets that would transform him forever. From Goodreads

It is definitely a scary splatter horror story. A bit too much splatter for me but good none the less.  I liked the idea of Lemarchand's box which is the connection between our world and the Cenobites and the way it was kept in circulation in our world.

This book qualifies for: 
100 books in a year Reading Challenge 2012, 
Goodreads 2012 Reading Challenge, 
2012 Ebook Challenge,
A-Z  Book Challenge 2012,
FrightFall Read-a-Thon October 1 - 7 2012