Demons of Air and Darkness is a Deep Space Nine novel written by Keith R.A. DeCandido and published in September 2001. It is the fourth novel in both the Deep Space Nine Relaunch and the Gateways miniseries. This novel features the Hirogen and the Malon, two races native to the Delta Quadrant that were introduced in Star Trek: Voyager. The novel ends on a cliffhanger, which is concluded in Horn and Ivory, one of the novellas featured in What Lays Beyond, the final book in the Gateways miniseries.
Once they moved from world to world in a single step, through innumerable doors that spanned the galaxy. They were masters of space, and to those who feared them, they were demons of air and darkness. But long ago they left their empire and their miraculous technology behind. Now someone has found the key to it, and all those doors have been þung open. GATEWAYS DEMONS OF AIR AND DARKNESS
A world near Deep Space 9™, threatened with destruction from the distant Delta Quadrant, becomes the focus of a massive rescue effort as Colonel Kira Nerys, her crew, and some unexpected allies Þght to avert disaster on a planetary scale. Meanwhile, as Lieutenant Nog and Ensign Thirishar ch'Thane search for a way to shut down the spatial portals forever, Quark becomes involved in a dangerous game that could determine, once and for all, who will control the Gateways.