On the morning of April 15, 1987, as he studied for his college entrance exams, Gregory Aller had his first visit from the aliens. "This brilliant white light appeared," Aller, now 29, recalls. "Space aliens were directing this. They told me I was going to become Speaker of the House. Then President Bush and Vice President Quayle would die. As President, I would unite our world with a dying alien planet whose sun was going out."
Soon Aller was visiting cemeteries. "I'd put my hands on the tombstones and make mind contact," he says. He would see his deceased grandmother walking...