Cassandra Clare, Sarah Rees Brennan, Maureen Johnson and Robin Wasserman come together to make a minor character become a central figure in the Shadowhunter legacy.
Simon Lewis, nerd, geek, recently undead, decides he will become Nephilim.  Of course that means self-examination, sacrifice and no pizza. Pretty difficult for a boy from New York.
A variety of guest instructors tell their history which fleshes out the history of Simon.  Very well written with thought provoking moments that will make the reader analyze their motives in life. 
Excellent read!!!!!

The Bronze Key by Holly Black and Cassandra Clare

Holly Black and Cassandra Clare join forces for year three of the Magisterium Series. 
Call, Aaron and Tamara have entered their third year of training in magic with a shadow over their head.  First Call has had a major rift with his father but then goes to his rescue when he learns his father has been taken.  Becoming a Makar is just a side effect of his trials and tribulations.
As with most young adult fiction the keeping of secrets becomes the downfall of the trio. A bit predictable at times but a good read for the middle schooler that loves fantasy.

The Copper Gauntlet by Holly Black and Cassandra Clare

The second in the Magisterium series by authors Holly Black and Cassandra Clare.  Callum Hunt has passed the Gate of Control at the end of his first year learning of magic that his father did not want him to become educated about.  As the summer ends Callum leaves home is fear of his life and the life of his chaos ridden wolf.
A mixture of magic and destiny, or the ability to change destiny and expectations.  Page turning, well written and appealing to the fantasy reader.

The Hammer of Thor by Rick Riordan

Magnus Chase has settled into his life in Valhalla, as well as anyone can settle into a life, or afterlife, of an einjher.  Then Thor loses his hammer, the one he rules the world with, the one that keeps the earth giants under control, you know, the important one.
The second novel in the Gods of Asgard series is very good.  Funny, fast paced and has a wealth of information about the Norse gods and goddesses.  Highly recommended and not only for the young adult reader.

Isle of the Lost by Melissa De La Cruz

All the evil ones of Disney are regulated to a single island, where no magic is possible.  That seems fair, except these evil doers have families that are also punished because they are the children of evil.  If you want some bad chaps, put all the bad chaps in one place, nothing good will come of it, or will it?
Basic Disney fair with a little twist and a big moral tale.  Will really appeal to the younger middle school reader.