"Trent's Last Case" by E. C. Bentley

The well-known description "Golden Age" [of detective fiction] is commonly taken to cover the two decades between the First and Second Wars, but this limitation is unduly restrictive. One of the most famous detective stories regarded as falling within the Golden Age is Trent's Last Case by E. C. Bentley, published in 1913. The name of this novel is familiar to many readers who have never read it, and its importance is partly due to the respect with which it was regarded by practitioners of the time and its influence on the genre. Dorothy L. Sayers wrote that it "holds a very special place in the history of detective fiction, a tale of unusual brilliance and charm, startlingly original." Agatha Christie saw it as "one of the three best detective stories every written." Edgar Wallace described it as "a masterpiece of detective fiction," and G. K. Chesterton saw it as "the finest detective story of modern times." Today some of the tributes of his contemporaries seem excessive but the novel remains highly readable, if hardly as compelling as it was when first published, and its influence on the Golden Age is unquestionable.

P. D. James, Talking About Detective Fiction, 2009