Chicago. The Roaring Twenties. When private detective Brennan O'Sullivan is hired to investigate the mysterious death of a reporter, he follows his only lead - a jagged, cryptic symbol - on a trail that will lead him to unknown horrors hiding at the edge of reality.
Another warning from the dead. Plagued with bizarre visions, Sully's investigation begins to lead him towards the abyss.
All the clues have led Sully to a seemingly-normal nightclub. What strange bodies does this place have hidden in the floorboards, and what will happen to Sully's mind when he uncovers them?
Having come face to face with a great undying horror, Sully must drag himself from the grip of insanity to stop the shrieking madness that threatens everything.