Rod Serling famously dubbed the expanse between our greatest fears and the apex of human knowledge the dimension of imagination, the Twilight Zone. The reference to twilight (half-light, half dark) is not lost on astute readers of speculative fiction, well-acquainted with the moral symbolism of light and dark. It is the darker edge of twilight merging with night that concerns us because this is where nightmares dwell. Delving deeper into the darkness is what fuels the fearful mind.