I'm never happy about writing negative reviews, but I always have to be honest. The only positive thing I have to say about this book is that the writing itself is fine, aside from some obvious editing issues. Sentence structure is good and the author gets a nice rhythm going. Her writing is easy to read. From there, it all falls apart.
First, I have to comment on the cover. The photo gives me the impression of a historical piece, but this is a modern day story. This issue doesn't affect my rating or review, it's just something worth mentioning.
Next we have the characters. There is virtually no character development. I'm aware that this is a novella, but short fiction does not have to and should not be vague and incomplete. I read this entire book and still have no idea who these people are. Even the barest details were absent, such as physical descriptions. Are the characters tall, short, fat, skinny, pretty, ugly? I have no idea. And I find it impossible to care what happens to characters I know nothing about.
Next we have glaring plot holes and actions that are entirely too convenient with no explanation. For instance, in one scene a friend rushes into Isabelle's hotel room to check on her well being. How did he get in? Hotel staff doesn't just let strangers into a person's room. In another scene, someone is drugged and unable to stay conscious. Yet no one takes this person to the hospital or so much as suggests a doctor visit. The drugged person is simply coddled and put to bed.
I'd like to say there was some redeeming factor in the end, but there wasn't.