A serial killer in Fork can bring them to Red Jack’s. Brutal murders, and strange words written in blood on the walls: “Ebeorie” at first, and then strange symbols. The first word doesn’t translate magically (as is common with place names or personal names) but the second two mean “master of unrest” or “master of chaos” or “lord of discord” or “conflagration king”. Something like that.
Place three or four murders in the general vicinity of the door, spaced maybe two to three weeks apart. Model them after the Jack the Ripper murders: surgical removal of organs, lots of blood, etc. Then, one more after the player characters become aware of the murders, with the strange runes written in blood on a nearby wall.
There are occasionally cherry blossoms at the scene of the crime. The authorities won’t notice them, but the player characters, being attuned to the strange, will.
The victims are prostitutes. The murders are committed by a ride-along of the demon Ebeorie. In his madness, the murderer sometimes writes the voice he hears on the walls: the words of power that summon Ebeorie.