Horning laughed. Of a sudden he felt bold and reckless. "I told you the
first time. I came from another world, a different plane--"
The gun moved in a flat, incisive gesture. "I know all that! The
parallel worlds, the Worlds of 'If'. Parmenides and his theory of the
Eternal Now. The idea that life's a book with an infinity of pages;
that every event automatically creates coexisting planes, one for each
possible outcome--" Horning's captor broke off. "But _why_? What drove
you to cross the barrier?"
Horning shrugged. "It was Myrtle--" he began wryly.