Once upon a time not long ago, two responsible college professors, Lynn the psychologist and Kathy the literary scholar, fell in love with the television show "Supernatural" and turned their oh-so-practical lives upside down. Plunging headlong into the hidden realms of fandom, they scoured the Internet for pictures of stars Jensen Ackles and Jared Padalecki and secretly penned racy fan fiction. And then they hit the road crisscrossing the country, racking up frequent flyer miles with alarming ease, standing in convention lines at 4 A.M.
They had white-knuckled encounters with overly...