Cassandra Clare and Holly Black are behind the popular book series The Mortal Instruments and The Spiderwick Chronicles, respectively, and are now collaborating on the fantasy series picked up ...

Read an exclusive excerpt and take a first look at the cover of The Iron Trial: Book One of the Magisterium (out Sept. 9), a new children's series co-written by Cassandra Clare, author of The ...

Authors Cassandra Clare and Holly Black have been best friends since they met 12 years ago at Black's first book signing in New York City. They share a childhood love of J.R.R. Tolkien, Star Wars ...

Magisterium, a new young adult fiction series co-written by Holly Black and Cassandra Clare, moves deftly into the gap left by Harry Potter and is gripping from the four-page prologue to the first ...