The Murderess of Slaughterhouse Gulch The Murderess of Slaughterhouse Gulch chronicles the transformation of Polly Bartlett from a desperate seventeen-year-old in Cincinnati's slums to Wyoming Territory's most notorious serial killer. Beginning with petty crimes alongside her father Jim, Polly evolves from victim to predator after discovering the intoxicating power of controlling others' lives. In 1868, the Bartletts establish an inn near South Pass City, using hospitality as a weapon to lure wealthy travelers to their deaths. Polly perfects sophisticated poisoning techniques, documenting each murder with clinical precision while accumulating over $100,000 from twenty-three victims. Her methods range from arsenic-laced wine to carefully staged "accidents," all designed to appear as natural deaths or frontier mishaps. The killing spree attracts attention when prominent victims like Theodore Fountain disappear. Pinkerton detectives Peterson and Sullivan investigate while Ed Ford seeks vengeance for his murdered brother Sam. The web closes when Otto Kalkhorst, driven by grief over Theodore's death, takes justice into his own hands. The novel explores themes of frontier lawlessness, moral decay, and the thin line between civilization and savagery. Through vivid historical detail and psychological complexity, it examines how extreme circumstances can transform ordinary people into monsters-and how stopping monsters sometimes requires becoming equally dangerous in return. The Murderess of Slaughterhouse Gulch chronicles the transformation of Polly Bartlett from a desperate seventeen-year-old in Cincinnati's slums to Wyoming Territory's most notorious serial killer. Beginning with petty crimes alongside her father Jim, Polly evolves from victim to predator after discovering the intoxicating power of controlling others' lives. In 1868, the Bartletts establish an inn near South Pass City, using hospitality as a weapon to lure wealthy travelers to their deaths. Polly perfects sophisticated poisoning techniques, documenting each murder with clinical precision while accumulating over $100,000 from twenty-three victims. Her methods range from arsenic-laced wine to carefully staged "accidents," all designed to appear as natural deaths or frontier mishaps. The killing spree attracts attention when prominent victims like Theodore Fountain disappear. Pinkerton detectives Peterson and Sullivan investigate while Ed Ford seeks vengeance for his murdered brother Sam. The web closes when Otto Kalkhorst, driven by grief over Theodore's death, takes justice into his own hands. The novel explores themes of frontier lawlessness, moral decay, and the thin line between civilization and savagery. Through vivid historical detail and psychological complexity, it examines how extreme circumstances can transform ordinary people into monsters-and how stopping monsters sometimes requires becoming equally dangerous in return.