Lock Every Door by Riley Sager

Jules lost her job, caught her boyfriend cheating on her and is forced to sleep on her best friends couch. 

When a job opportunity presents itself, she jumps at the chance and finds herself as an apartment sitter in a posh, exclusive apartment complex. The opportunity seems too good to be true but Jules is desperate and quickly finds herself a a "resident" of  the Bartholomew. She has a list of what she can and cannot done. The list is peculiar but she needs the money and is determined to get back on her feet.

Jules quickly finds out that the Bartholomew has sinister history behind it and the residents are not exactly "normal" despite this she makes a friend but when that friend goes missing she makes it her mission to figure out exactly what is going on but it's riskier than she ever imagined.

This book is creepy and addictive. Expect to stay up all night finishing this read. You won't be disappointed.