I read and loved The Age of Miracles by this author a few years ago so I was looking forward to reading her latest book. I thoroughly enjoyed this speculative mystery, which I listened to on Bookbeat.
The story is narrated by Jane O and her psychiatrist Dr.Byrd. Jane has been suffering from a series of hallucinations and periods of amnesia since having her young son. The latest one lasted several days and she was found in the park, not knowing how she got there. 
I loved the psychological aspect of the story and found Dr.Byrds theories about Jane's blackouts really interesting. It was fascinating to delve into the subject of memory, too.
I thought the dual narration worked well as both had a slightly different vantage point  on what was happening to Jane. I was really intrigued about Jane's relationship with Nico and what had happened to him.
I listened to this in just a few days as I was really engrossed in the story. I read the very last part as I was lucky to have a proof  and wanted to find out how the story resolved. I didn't predict the ending at all and I thought it was quite clever.
Overall, this was such an original mystery with great memorable characters. A thought provoking read.