The Binding Oath — Sybil Downing

Out of the ashes of disillusionment following World War I, the Ku Klux Klan rose to new heights, its four million members spreading racial and religious hatred across the nation. Outside of the South, Colorado was one of the Klan's strongest enclaves.
On a hot June day in 1922, the Grand Dragon of Colorado's Ku Klux Klan holds a press conference in Denver's most elegant hotel, announcing that the Klan intends to recall the popular district attorney and replace him with one of its own members. To the Grand Dragon's dismay, the only person who attends is Liz O'Brien, a smart, determined, and independent-minded reporter from the Denver Post. Her editor dismisses the story as unimportant, but when Liz stumbles upon a murder in the Denver slums, she suspects that the Klan is involved. Hampered by a police force riddled with corruption, district attorney Phil van Cise struggles in vain to produce the killer. Liz becomes convinced that Van Cise's recall will unleash Klan rule across Colorado. Armed only with the victim's name, she races against time to uncover the evidence that will lead to the killer and stop the growing wave of terror.