The Night Circus, Part One

I've been reading The Night Circus lately, and I may have a new favorite book, depending on how the ending is handled.  The pacing is much like a train that carries a circus, slow and sedate at first while one's interest is peaked by the spectacle and oddities glimpsed within, but picking up speed at a rate that is initially imperceptible.  I am two thirds of the way through and I am beginning  to feel how out of control the world within the circus has become, as though I am trapped on a train hurtling towards a cliff or a brick wall.  I feel the end will be catastrophic or wondrous, either way it will be incredible.