"The Automobile Girls at Chicago" by Laura Dent Crane follows the thrilling adventures of Barbara Thurston, Mollie Thurston, and Grace Carter as they visit their friend Ruth Stuart in Chicago. The story begins with a dramatic train accident that the girls narrowly escape, showcasing Barbara's bravery as she rescues a man from a smoke-filled compartment. Upon arriving in Chicago, they are warmly welcomed by Ruth and her family, including her father, Robert Stuart, who is a prominent figure in the city's financial world. The girls are introduced to the bustling life of Chicago, attending an opera and visiting the Board of Trade, where they witness the chaotic energy of the trading floor. Barbara is particularly affected by the sight of a man she recognizes from the train, whose menacing demeanor leaves her shaken. As the narrative unfolds, the girls become entangled in the complexities of the financial world, learning about the pressures and challenges faced by Mr. Stuart. They also meet Olive Presby, a charming young woman whose family is struggling with financial difficulties and the mystery of a long-lost treasure. The story weaves together themes of friendship, courage, and the pursuit of justice, as the girls navigate the social and economic landscapes of early 20th-century Chicago. Through their adventures, they demonstrate resilience and resourcefulness, embodying the spirit of the "Automobile Girls" series.