A man stands accused of a brutal murder, relying on his wife to provide the crucial alibi that will secure his freedom. The narrative centers on Leonard Vole, who faces a capital charge for the death of a wealthy widow, and his solicitor, Mr. Mayherne, who must navigate the shifting testimonies of those involved. As the trial progresses, the story examines the reliability of memory and the calculated nature of human deception. The narrative framework utilizes a sharp, observational style that emphasizes the procedural tension of the courtroom and the psychological maneuvering of the witnesses.

This work is widely recognized as a quintessential example of the author's mastery of the short-form mystery. Critics often highlight the precision of the narrative structure and the effectiveness of the final twist in challenging the reader's assumptions. The story has maintained its status as a staple of the genre, frequently adapted for stage and screen due to its inherent dramatic tension. Readers consistently note the efficiency with which the plot is executed, leaving little room for extraneous detail while maximizing the impact of the central conflict.