The Robthorne Mystery is a 1934 detective novel by John Rhode, the pen name of the British writer Cecil Street.

[1] It is the seventeenth in his long-running series of novels featuring Lancelot Priestley, a Golden Age armchair detective.

[2] Warwick Robthorne is found dead on Guy Fawkes Night in the greenhouse of his twin brother's country home, apparently having committed suicide.

One knows that there will be a sound plot, a well-knit process of reasoning, and a solidly satisfying solution with no loose ends or careless errors of fact.

"[3] Isaac Anderson in The New York Times remarked that "no one who has ever read a Dr. Priestley story will be surprised to learn that this is a genuinely baffling crime puzzle of the first quality".