4.5 stars. Amazing book, and I already look forward to reading it again sometime.

EDIT: Two days later and this story and it's characters are haunting me. Upgraded to five stars. The storytelling is just clever. It's hard to write much more than that without giving anything away.

Really enjoyed this book and both narrators of the audio book!
Was a tiny bit surprised at the (probably realistic) level of torture/violence because of its Young Adult category. I mean, I'm no stranger to this in YA, but for some reason it continued to surprise me here. Plus, both protagonists are seemingly early-mid twenties (even when they don't act like it), so to me this was just more adult than young adult, but whatever.

Loved the Scottish accent of the Queenie narrator; liked that Queenie was telling her story from Maddie's point of view; did think there were slow moments/long descriptions. I was surprised to find that I thought the piloting and flying descriptions were interesting--at first. When the POV switched, I was VERY glad to not have any more of those.
On the whole, I enjoyed the story and the girl's friendship. I think some bits could have been shorter, and perhaps some more suspense or action could have really spiced things up, but I liked the book.
Would recommend to people interested in female friendship and female pilots in WWII.