I loved this book! I knew I would because--hello? Kelley Armstrong? I haven't read anything by Melissa Marr...but she's got to be talented if KA's willing to work with her. 
 So, yes, it's middle grade, which I normally don't read. I won a copy via Shelf Awareness and I'm actually sorry I did because the ARC comes without the illustrations. I think my students would really like this one (though the reading level is higher than my students'), as it echoes the Percy Jackson books in all the Good Ways. It lacks, perhaps, the humor of Rick Riordan's writing (my students LOVE his chapter titles), but has more than enough to satisfy in terms of adventure and mythological creatures. There's an intriguing cast of characters (Matt's probably my favorite), and I'm more than happy to follow them on their journey(s).