I ploughed through this book in a handful of hours - I couldn’t put it down.
I’d heard a previous reviewer compare the story and the main character to Dexter - but, much as I enjoyed that series, I found this story more compelling, and this protagonist more multifaceted.
(That said: I could easily imagine Cara generating a Dexter-esque series of novels - and would happily queue up in the rain to buy them).
If you like morally-ambiguous characters with complex motivations - read this book. If shadowy deeds and serial killer stories are your thing - again, read this book.
Frankly - you should read it even if your usual fare is nothing but Harlequin romance.
You won’t regret it.