Riders in the Sky - Grant, Charles L

The Four Horsemen of the Apocalypse gather on an island, where War prepares to lead them to Earth's ultimate doom. A handful of no-longer ordinary humans, accidentally transformed by the Horsemen themselves, are ready to stand against them. Earth's fate will be decided.

Riders in the Sky 2000, Tor Books, New York

ISBN-13: 9780812562866

Mass-market paperback

Riders in the Sky 1999, Forge, New York, NY

ISBN-13: 9780312862794