Club Shadowlands (Masters of the Shadowlands book 1) by Cherise Sinclair

Extremely authentic and all encompassing of BDSM with a large but sometimes subtle aspect of safe, sane and consensual.  This book is a million times better than the 50 Shades of Grey crap.  Every time that I read this book I like it even more because I have yet to find any punctual or grammatical errors.  While not my favorite in the series it definitely gets the ball rolling and makes you want to read the other books that follow.