I really enjoyed the audiobook of this. I haven't seen the physical book, but I'm going to look at it in my school's library tomorrow because the way this was narrated had me seriously imagining what the words look like on the page.

Sunny is a character with very chaotic, wild, loud thoughts, and that really comes through in the narration, which I enjoyed. I am by no means an expert, but his sudden subject changes and his fascination with the way things sound and taste made me think he might have ADHD. The author doesn't specify anything like that, so I don't want to project, but he did say that Sunny was a "weird" kid. Sunny was a very interesting character, and I think this might be my favorite book in the Track series so far!