Be warned - hardcore BDSM. This book took a little while to get going for me. Simon came through as a very strong character for me. Dominant, sadistic, reserved, cautious and in constant control yet not too overbearing. Maura was more confusing. I never completely got that Maura wanted to a sub in the same capacity that Simon wanted to be a dom. Maura's personality seemed much more hidden.
The book kept jumping back and forth over the time of their relationship which was a little distracting and caused the ending to be a little too abrupt. Also, the encounter with the Senator seemed out of place.
Overall, if you're looking for a darker read with heavy BDSM themes, you might like this one.