Ghosts are real and dangerous. But they're also valuable, their ectoplasm capable of curing countless diseases. There's only one problem: Harvesting the wonder drug can be just as deadly. Prisoner Gus Ortiz is willing to take the risk in return for a reduced sentence-anything to see his daughter again. All it will take is a few months at sea scraping ectoplasm off the walls of the Perdition, a floating prison containing the most vicious ghosts on Earth. Surrounded by dark waters, Gus soon realizes that angry spirits are the least of his worries.