You already know how much I love Terry Pratchett, and Witches Abroad trumps nearly every book pitted against it - unless it's another one of Pratchett's, but The Night Circus is a sparkling dark gem of a book. So it gets the spotlight. I'm sure Granny Weatherwax and Nanny Ogg (and even Magrat) wouldn't mind.
First off, The Night Circus has a black, white and gray theme, which I love. It's also a circus. It's also an elaborate game between the students of two very powerful magicians. It's also a romance - a slow-building, authentic romance. All of these things are made of win.
The imagery in this book is to die for. The characters in this book break your heart. You leave this book feeling wistful and affected and slightly melancholy, wishing that the Dream Circus was a real place you could visit yourself.
And poor Chandresh! I love Chandresh. He's just a man who had a dream of a wonderful circus, who couldn't help being seduced by the flickering lights of his own dream. Then he realized it had been someone else's dream all along; all he did was share it. But in the end he didn't mind.