When the gas lamps flicker out in the rowhouses of 1920s Philadelphia, the police line ends and detective Adrian Graves begins. He takes the occult cases that leave city officials whispering behind locked doors—crimes soaked in the surreal and the unholy. Patient, dangerously methodical, and entirely unshaken by things that howl in the dark, Graves tracks the impossible through the city's rain-slicked cobblestones. As an elite scholar of the esoteric, he approaches the bizarre with a specialized arsenal designed to measure, bind, and dismantle the unknown. His primary equalizer is a custom revolver loaded not with standard lead, but with a lethal cylinder of specialized munitions—salt-packed rounds for dissipating ghosts, cold iron for fey, and blessed silver for flesh-and-blood horrors. Backed by an eccentric collection of supernatural tools and a relentless eye for the truth, he is the only man willing to stare directly into the abyss to bring the monsters to heel.