This book was fun. It does playful things with structure. It takes the idea of a nested framing story and twists it around. The result is a sort of ziggurat of prose, each layer a piece of genre fiction. It's like six novellas. I liked some of the novellas, didn't like a couple. It was a fine, fine read for the bus.
Warning: this book got all kinds of glowing reviews which made it sound like some kind of earth-shattering Important New Novel. It does fun things with structure, but in the end those things don't add that much to the book. If you go in expecting this book to change the way that you think about literature, you will be disappointed. But it's still a fun book.