We were off to a rough start when I realized this book was written in present tense (can be perfect for short stories, I rarely enjoy it for longer works). We were off to an even rougher start when the first thing we learned about our main character was that she likes morning sex. If I'd been flipping through in a bookstore, or trying out an audiobook, I'd have called it right there on page 15.
But I did spend money on this book, and it's been on my TBR for five years, so I muddled on. 
We proceeded to add casual sexism and workplace negging to the mix. Implications that every woman whose ever been is 'innocent'. And after that... it was just desperately boring. Every bad murder mystery story I've ever read blended together and dragged out for 500 pages. 
I got this book back when I was a subscriber to Book of the Month, and it is the latest entry on my 'thank God I canceled that subscription' list.