If I can resume my feelings:
Send help 

This is one of the hardest book I've read. 
Zayne and Hallie are both struggling with their own life.
Zayne is a hardcore addict.
Hallie suffers from severe PTSD related to her repetitive abuse when she was a child. 
Now you know what you are heading to if you want to dive in this torturous toxic relationship of two lost soul mates.

As someone who used to be a social worker, I was amazed by the accuracy of the mental illness description. Everything felt right even if everything was wrong. 
The toxicity consumes you as it consumes people who suffer from these conditions.

The spice (🌶️🌶️🌶️) is also particulary sensual and well written.