When the prison ship Purge—temporary home to 500 of the galaxy's most ruthless killers, rebels, and scoundrels—breaks down in deep space, its only hope lies with a derelict Star Destroyer found adrift. When a boarding party is sent to scavenge for parts, only half of them return, bringing a disease that kills nearly all aboard the Purge within hours. The half-dozen survivors—two inmate brothers, a sadistic guard captain, a couple of smugglers and the chief medical officer—will do what it takes to stay alive. But nothing can prepare them for what waits aboard the vast creaking Star Destroyer, Vector.