In the Year of Their Lord (Lex Talionis #3).

The third short story in the series.

In the year 3012 AD, America is a different place. Illegal aliens are from other planets. Police shoot first, but rarely ask any questions, and Vampires run in packs from dusk till dawn. Amongst all this chaos, an ancient predator stalks the dark city streets. He is man's worst nightmare, and Earth's ultimate saviour.