What a mind fuck!  This book had so many things that I'm afraid of: enclosed, tight spaces; heights; loss of body autonomy; descent into madness; and of course a giant freaking monster!

I was, of course, on the edge of my seat absolutely speed reading this.  I had to know what was going to happen to Gyre!

The only reason this isn't getting 5 stars is that I really didn't like the romance between Gyre and Em.