Abaddon Books and Solaris Books are both British publishing imprints, that are part of the Rebellion group of companies, which includes the long-running British anthology comic 2000 AD, 2000 AD Graphic Novels, and  the RPG company Cubicle 7.

Abaddon Books publishes "shared world" novels in the horror, science fiction and fantasy genres. Describing itself as a return to "the good old days of pulp fiction," the imprint focuses on shorter, action-driven novels with dark or horrific themes. I created the steampunk universe of Pax Britannia for Abaddon Books in 2006.

Solaris Books is an imprint which focuses on publishing science fiction, fantasy and dark fantasy novels and anthologies. The range includes titles by both established and new authors. As of August 2010, Solaris had published seventy-three titles by twenty-nine authors, including anthologies and new editions of out-of-print titles.