Anna Katharine Green 
X Y Z A Detective Story 

X Y Z: A Detective Story is a classic mystery novel by Anna Katharine Green. The story follows the investigation of a murder that takes place at a masquerade ball, where guests wear elaborate costumes and masks to conceal their identities. The case is taken up by a clever detective named Ebenezer Gryce, who must navigate a complex web of clues and suspects in order to solve the crime. The novel features an anonymous narrator who provides a humorous and lighthearted perspective on the proceedings, offering plenty of witty one-liners and amusing observations along the way. With its engaging plot, colorful characters, and clever writing, 'X Y Z: A Detective Story' is a delightful read for fans of classic mystery novels. Green's skillful storytelling and attention to detail make this a standout work of detective fiction that continues to captivate readers to this day.