This was much darker than I thought it would be. 
With themes of postpartum depression/psychosis.

Isabelle is portrayed as an unreliable narrator. With her history of sleepwalking, a mystery in her past and being sleep deprived now her son is missing. 

Throughout the book there's moments where you question both Isabelle and her husband Ben. I found some things became obvious but they didn't ruin the story as the build up to those moments had me gripped. 
This book has twists and turns throughout. Making me question everyone. 

While it took me a couple of chapters to get fully invested once I was I just couldn't put the book down. Not wanting to sleep until I finished.