The Illinois Detective Agency (Book 3)
During the Miles City, Montana, founding day celebration, James Duffy's future wife, Sylvia Trent, attended the dance with a family friend. Sometime during the festivities, she went missing and wasn't found until the next day by a stable hand in the loft. Sylvia was raped and murdered by strangulation. An investigation leads to one suspect, a man named Robert Peru, a cowboy at the Trent Ranch. Peru, a Mormon, had family in Salt Lake City, Utah, and having no other leads, that is where Duffy, Jack Cavill, and Joseph Goodluck go.