The Metropolis Case is the debut novel of American author Matthew Gallaway. The novel follows the interconnected lives of four characters living in different cities, all of whom have a great passion for Richard Wagner's opera Tristan und Isolde. The New York Times said "the book is so well written ... and filled with such memorable lead and supporting players that it quickly absorbs you into its worlds." In the Washington Post, Eugenia Zukerman wrote that "Gallaway has taken a great risk ... by creating an intricate, multilayered tale that slides from past to present, from Europe to New York, from opera to pop. But despite the complexity, The Metropolis Case engages the reader emotionally on every page."