Cassandra Clare, the author of The Mortal Instruments, and Holly Black, most known for the Spiderwick Chronicles, have teamed up to write a new book series titled The Magisterium.
I'm not sure who the artist for the cover is, but they did an amazing job!
From the prologue, this book seems very promising and I can't wait to read the rest. The series is aimed at middle readers - the same category as Percy Jackson. The Iron Trial will be available in the US the 9th of September.
You can read an excerpt from the book here.