Lock Every Door by Riley Sager

A sweet apartment-sitting job turns into a remake of "Rosemary's Baby" in this frightening tale. Jules gets offered a too good apartment-sitting job in a posh old building that she has loved since childhood. Sure, there are a lot of rules to follow and her life will get a bit more complicated but she takes the job. As she begins to fall into a routine and gets to know the residents of the Bartholomew, things seem a bit off. As she does some research on the building and its famous inhabitants over the years, she starts to want out of the deal. The problem is that part of the deal is that you can't leave. She is afraid to stay and more afraid to leave. Creepy, scary and a one-sitting read, this book will have you checking lease agreements and your neighbors much more thoroughly.