4.5 Another good title with surprisingly deep characters and a somewhat ambiguous dilemma. Could have used another twenty pages before the resolution to make it a little more suspensful, but that's about the only criticism I have. The second half of the series presents even more shades of grey than the first half, which is nice in young adult fiction. And kudos for providing shipping fodder for tree and millipede fans. I feel a lot of infinite diversity in infinite combination sentiment in this one.