Thanks to Netgalley and Bold Strokes Books for an early copy of this book.

One day on his way to school Barnabas stumbles upon a subway map with an unknown subway line. This discovery leads him to a hidden valley where he uncovers a terror plot to destroy his city. It is up to him to stop the deadly plot.

This is a YA book that deals with many typical teenage problems but the story's whimsical nature, fun names and lack of in-depth world building means it reads as more Middle Grade at times, so would be a good book for those transitioning from Middle Grade books to YA.

The plot was slow at times to start off, but the last ⅓ was very tense and I had to read it in one go.
 

Overall a fun book with many great characters, many of whom are LGBT without it being a big part of the story which is always great to see.