Even better than the first one in the series - everything I appreciated about the first book and it's handling of real world events in a believable manner was turned up to 11 in this book. And the characters, with their all too believable flaws, grew on me even more. And, of course, the scientific mystery at the heart of the book played out really well. It reminded me of the Vorkosigan Saga, not just because of the cryonics thing, but because of the fast-pace sense of "hurry up and figure out what the least worst thing to do here is" is a crucial part of both stories. I really enjoyed this one.