THE REGULATORS by Stephen King, published under the name Richard Bachman.

The Regulators is a novel by American author Stephen King, writing under the pseudonym of Richard Bachman. It was published in 1996 at the same time as its "mirror" novel, Desperation. The two novels represent parallel universes relative to one another, and most of the characters present in one novel's world also exist in the other novel's reality, albeit in different circumstances. Additionally, the US hardcover first editions of each novel, if set side by side, make a complete painting, and on the back of each cover is also a peek at the opposite's cover. King had previously "killed off" Bachman after the pseudonym was publicly exposed around the time of the 1984 release of the Bachman novel Thinner. However, on the book's jacket and in a tongue-in-cheek introduction by the book's editor, it was alleged that this 1996 work was written by Bachman years earlier, but the manuscript had only recently been discovered by his widow in a trunk. The novel began as a screenplay titled The Shotgunners. King says that film writer-director Sam Peckinpah read the script and made some suggestions, but Peckinpah died while King was writing the second draft.