Post-alien invasion Belfast. Earth has been defeated. Pity the locals aren't listening. Teenager John Dray will do whatever he must to survive. When he's offered desperately needed food in exchange for dispersing a mysterious compound over the city, he takes the job. The compound turns out to be lethal to the alien invaders and John is charged with xenocide. He's sent to Inish Carraig, a forbidding prison, where he discovers a conspiracy that threatens Earth and everyone he loves. He has to unveil the plot. He just has to get out of prison first.