The Armegeddon Engine — James Swallow

Adrift in deep space, Commander John Koenig and the people of Moonbase Alpha face an uncertain fate, when a planet-killing alien weapon at the heart of a sinister cloud diverts their lost Moon on to a fatal trajectory. As each moment brings the Moon closer to total obliteration, Koenig leads a desperate mission into the unknown to save all life on Alpha. Does hope lie among a rag-tag colony of refugees hiding in the shadow of devastation? Or can the Alphans find a path into the heart of the war machine and end its destructive rampage? With time running out, the answer will mean the difference between survival...or annihilation.