In a flooded future London, Detective Harley Stone hunts a serial killer who murdered his partner and has haunted him ever since — but he soon discovers what he is hunting might not be human.
Living in an estate on the shores of Lake Geneva, Lord Byron is visited by Percy and Mary Shelley. Together with Byron's lover Claire Clairmont, and aided by hallucinogenic substances, they devise an evening of ghoulish tales. However, when confronted by horrors, ostensibly of their own creation, it becomes difficult to tell apparition from reality.