From the publisher's site:
Galt's executioners are the masked and mysterious Gray Gardeners. Held above the laws of the chaotic nation, these grim killers soak the revolution-wracked land in dread and blood. They behead the guilty and innocent alike with their magical guillotines, but few possess the courage to stand against them. Powerful heroes must infiltrate the Gray Gardeners and put an end to their reign of terror. As the heroes race from haunted crypts to the elegant opulence of an ill-fated masque, the midnight chime will bring salvation or doom to a nation.
Night of the Gray Death is a deluxe adventure in Gothic horror for 16th-level characters written by Ron Lundeen. It exposes the secrets of the Gray Gardeners with new monsters, new magic items, and new challenges to test the mightiest heroes. Mysteries and intrigue abound during the Night of the Gray Death!