Willie falls in love with Nettie, but when she elopes with an upper-class man, Willie resolves to kill them both. Throughout the novel there is present in the sky a large comet which gives off a green glow. As Willie prepares to shoot the lovers, two battleships appear and begin shelling the coast, causing Willie to nearly lose his targets. As the comet enters the atmosphere, it gives off a green gas which envelopes everyone including Willie, who falls asleep.