I tend to follow the Goodreads standards for what each star means and three stars means 'liked it.' Many view three stars as bad. I don't, unless you view liking something as an unenjoyable experience. But I digress. I enjoyed myself. 
 Was it in any way like Gone Girl, what with that bit of grit, edge and exceeding desire to turn that page and turn it quickly? No, not really. Was the ending, the 'who done it,' unpredictable? No, not really. But as we know, stories don't need to be extra special or even unpredictable to be enjoyable, to have an overall good time reading them. 
 I did struggle from time to time with the characters. I found the tone to be the same throughout, not really differentiating their personalities from one another (since this book is told from three female perspectives) and having to constantly look up to double check whose perspective I was reading this from. But, on the flip side, much like the suspense/thriller genre, it was quick pacing and an ease to read. 
 I will say, I will probably now look at my new love and use of public transportation in a different way. 
 Three stars. I liked it.