It is two-thirteen in the morning when a sound shatters the silence. At first, you might dismiss it as a fragment of a dream—a distant siren, a restless animal. But it comes again, sharper this time, insistent, and aimed directly at you. Your eyes snap open in the dark. Your heart hammers against your ribs as you realize this is no dream. This is the night caller.
For millennia, humans have be...
