Star Wars novels. Death troopers

"When the Imperial prison barge Purge breaks down in a distant, uninhabited part of space, its only hope appears to lie with a Star Destroyer found drifting, derelict, and seemingly abandoned. But soon after a boarding party returns from a scavenging expedition, a horrific disease breaks out and takes the lives of all but a half-dozen survivors whose only option forces them to return to the Star Destroyer--and the soulless, unstoppable dead waiting...