It's a good book, even though the "shocking twist" is a tad predictable. A bit too graphic for my personal taste, but kudos on the whole "not sugarcoating thing". 
 Good characters, but the ending kind of ruined Helen for me, at least a bit - the worst thing about this book: as someone else said, how the fudge the "awesome" detective Helen was not able to see who was doing it sooner?! How?! (view spoiler)[She even suspected it was something against her somewhere before the middle of the book! She knew it was a personal vendetta against her! So how come did she not know who it was? "Hmm, let me see, who could have such a personal problem against me... Someone who is aggressive... Clearly a disturbed person with some kind of psychological problem... maybe coming from years of abuse... And doesn't have a problem with killing... And who I may have wronged in some way... Who can it be, who can it be?" (hide spoiler)]