Anna has suffered from agoraphobia ever since she was in a car accident with her husband Ed and their daughter Olivia. Because of this terrible disease and a brief affair Anna had, Ed leaves her and takes Olivia with him. Now Anna spends her days looking out of her window, spying on her neighbors.

Anna spots a new family moving in across from her. It looks like a mother, father and one son. One day the son, Ethan, comes over to introduce himself to Anna. Before she became agoraphobic, Anna was a child's psychiatrist and can spot a troubled teen when she sees one. Ethan seems to have some problems in his family life. Ethan's mother Jane also comes over to meet Anna, and they develop a friendship. One night when Anna is looking out the window, she spots Jane against the glass with a knife in her and blood dripping down the window. Anna calls the cops and they go to investigate, but nothing is found.

Anna knows what she saw, but the cops are looking at her like she is a little insane. Additionally, Ethan's father tells her to mind her own business. Anna sees Jane from her window and knows that this is not the Jane she met and befriended. In an attempt to find out what is going on, Anna knows somehow she must get out of the house and follow the mother. So, Anna tries using the exercises that were given to her and opens the door and goes out in the world. However, she is caught by the mother and returns home, only to have the police show up again.

Anna knows that there is something strange going on in that house, but how is she going to prove it when no one will believe her?

Wow, A. J. Finn wrote a great mystery thriller. I was shocked by the end of THE WOMAN IN THE WINDOW; it was not at all what I was thinking! I can't even imagine how Anna or anyone like her can survive with this disease. Finn gets you right into the storyline, along with putting yourself into Anna's life. There are so many twists and turns in this story that I couldn't wait to see what would happen next. There is a lot of information about what caused Anna to be afraid to leave her house, but this all adds to the end of the book, which will truly surprise you. If you are into thrillers, this book is definitely one to get.