I really liked this book. Really it was a solid 4 and a half stars. 
 It's about Rachel Watson, a divorced, alcoholic who rides the train and watches a house on Blenheim Street. It is the house of a couple she doesn't know but obsesses over after going past every day on the train hundreds of times. Soon enough through her often hazy drunken observances and interference Rachel is entangled in twisted murder mystery. As it goes on you can't help but be drawn deeper in by Rachel's thoughts and suspicions. It's almost like being inside the head of a gossip only she is so often drunk and even blacks out that there are things missing she has to piece together afterward. There were also other characters whose points of view were told through out the book that gave insight to Rachel's missing knowledge. 
 I couldn't put this book down. It totally sucked me in and had me dying to know the end. There were so many pieces to the puzzle and it was completely satisfying when they all fit together in the end.