The Light at the End — John Skipp

The newspapers scream out headlines that spark terror across the city. Ten murders on the New York City subway. Ten grisly crimes that defy all reason, pattern, or m.o., no leads for police to pursue. The press dubs him the "Subway Psycho"; the NYPD desperately seeks their quarry before the city erupts in mass hysteria. They won't find what they're looking for.

Because they think he's human.