The Roman Hat Mystery (1929) is more than just a classic whodunit-it's the landmark debut of the writing team known as Ellery Queen, the pseudonym for cousins Frederic Dannay and Manfred Bennington Lee. The novel introduces readers to Inspector Richard Queen and his son Ellery, an amateur detective and writer, as they unravel the poisoning of a corrupt lawyer during a packed theater performance. The only clue: a missing top hat, a detail that propels the investigation through a maze of suspects and motives, all set against the backdrop of 1920s New York. What sets this book apart is not just its intricate puzzle and fair-play clues, but the way it heralded a new era in detective fiction. Dannay and Lee's collaboration brought a unique blend of intellectual rigor and narrative innovation, challenging readers to match wits with their detective. Their approach-meticulous plotting, logical deduction, and the famous "Challenge to the Reader"-redefined the genre's standards and expectations. The Roman Hat Mystery launched a bestselling series and laid the foundation for Ellery Queen's enduring legacy. This Warbler Classics edition includes a biographical essay.