Full disclosure: I read about a hundred pages and skimmed the rest to see if anything actually happens in this book. It does, around the 250 page mark (of a 294-page book), but it's not the kind of payoff worth slogging through 250 pages of Dani Hale being a shallow, psychotic, obsessive, stalkerish hypocrite. I can dig an unsympathetic character, but I selfishly prefer them to actually be interesting.
If that payoff forty pages from the end had come much earlier and led to a later, bigger payoff, this could have been a good book. As it is, I can only guess that the reason Jackie Collins "couldn't put the book down" as the cover claims is because someone super-glued it to her hands.