A banker lies dead, heart devoured from his chest. A woman is found asphyxiated in a room locked from the inside. When the moons are full, those who enter a haunted wood end up decapitated. These are but a handful of cases that Inspector Archibald Marshall must solve. Monsters and spirits have returned to the continent of Astryss, terrorizing a land that has forgotten how to fight these threats. Marshall is one of the few trained to combat mythical creatures. In a world ripe with magic and powered by steam, the detective investigates cases mundane and mystic, battling demons from Hell and within his own heart.