Constantin Films has acquired the rights to The Iron Trial, the first novel in a five-book series to be written by Holly Black (The Spiderwick Chronicles) and Cassandra Clare (The Mortal Instruments). Take a look at this brief plot description of the book.

"In this exciting new series, twelve-year-old Callum Hunt has grown up knowing three rules by heart. Never trust a magician. Never pass a test a magician gives you. And never let a magician take you to the Magisterium. Callum is about to break all the rules. And when he does, his life will change in ways he can't possibly imagine."

This series marks the first collaboration between the two best-selling authors. Scholastic Books preemptively picked up the North American publishing rights earlier today. The Iron Trial will be published in 2014.

Robert Kulzer is producing the adaptation for Constantin Film. No screenwriter has been attached as of yet.