The book felt like a perfect spiral into madness. I felt like I was along for the ride with the MC as she slides deeper into fear and debilitating panic, all the while feeling like she is losing her memory at an alarming speed (are they related?!).  It was a perfectly balanced dance of psychology how the two things seemed to feed off of each other and sometimes I felt physical pain for Cass as she tries to navigate through it.  The writing for this psychological thriller was so well done and I was hooked as it sped up faster and faster until I could not put it down!

No spoilers!

I also really enjoyed the audiobook!