A consortium of Warner Bros./Heyday Films/Brad Pitt and Brad Grey have bought the film rights and are in the process of negotiating with Steve Kloves (screenwriter for the Harry Potter films) to write and direct.  After nearly 20 years writing and illustrating children's books, churning out television scripts, papering his walls with his own unpublished novels and firing his agent, Haddon has become an instant success.  "I have this fantasy that someone in that office has been beaten heartily on the bottom with a copy of this book," he says about his former but unnamed agent during an interview on a hot summer day in the Toronto offices of Doubleday, his Canadian publisher. 