This book doesn't exist -- it was never written and never will be written, as the publisher's license has expired.
http://forum.rpg.net/showthread.php?676289-Margaret-Weis-losing-Smallville-and-Supernatural&p=16466237#post16466237
http://forum.rpg.net/showthread.php?676289-Margaret-Weis-losing-Smallville-and-Supernatural&p=16466237#post16466237