"Third Level" is a short story written by Jack Finney that explores the concept of time travel through a mysterious train station. The protagonist, Charlie, discovers a hidden platform at the Grand Central Terminal in New York City that leads to a different era, specifically the year 1890. This platform represents an escape from the pressures of modern life. The story delves into themes of nostalgia and the desire to return to simpler times. As Charlie navigates this alternate reality, he grapples with the implications of his discovery and the choices he must make between the past and the present.