Wow. Easily five stars. This is a MUST for all Madeleine L'Engle fans - and anyone who enjoyed watching The $20,000 Pyramid game show! Once I really got started, I didn't want to stop until I had finished. And even once I reached the end, I went back and reread some parts again.
I loved the writing style with short chapters, most with titles that could be categories on The $20,000 Pyramid game show and applied in some way to the events in the chapter. The short chapters also moved the story along quickly, giving you just enough detail to make you wonder at the mysterious events and want to continue. As the story progresses, you start to realize that even some of the mundane events might have great significance. I'm not going to give too much detail, though, because this one is best enjoyed by not knowing too much about the plot before you read it.
I definitely want to read this again sometime, and I also need to see if I can get my hands on a copy of Rebecca Stead's first book, First Light
. I could definitely see this winning the Newbery award.