I am Legend by Richard Matheson

THEY CAME BY NIGHT. Came in their dark cars with their spotlights and their guns and their axes and pikes. Came from the blackness with a great sound of motors, the long white arms of their spotlights snapping around the boulevard corner and clutching out at Cimarron Street.

Robert Neville was sitting at the peephole when they came. He had put down a book and was sitting there watching idly when the beams splashed white across the bloodless vampire faces and they whirled with a gasp, their dark animal eyes staring at the blinding lights.