約翰·狄剋森·卡爾（1906－1977）

史上最偉大的推理小說作傢之一，舉世公認的“密室推理之王”。其小說素以公平著稱，綫索隱蔽，解答驚人，具有超乎尋常的邏輯性、趣味性。他一生共設計瞭超過五十種密室，幾乎每個都是構思精巧、無以復加；又兼其小說一貫具有的濃鬱哥特風格，以及其謀篇布局的架構能力之強，自會讓讀者大呼過癮，競相傳讀。讀推理，豈能不讀密室；讀密室，豈能不讀卡爾！

Only young James Answell could have committed the murder. After all, he was found unconscious in the locked room next to the body of the murdered man. His clothes were disheveled from an apparent struggle. The whiskey decanter containing the liquor he said was used to knock him out was full to the brim. All the glasses on the table were clean. His fingerprints were found on the murder weapon, an arrow from the victim’s collection. Furthermore, he was heard arguing with the dead man, whose daughter he wished to marry. Just about everyone is convinced that James is headed for a date with the hangman.

Everyone except Sir Henry Merrivale, H.M. to his friends and associates. He’s convinced that the real murderer used a “Judas window” to commit the crime. Pay no attention to the architects who designed the building, H.M. insists. In fact, he says, you’ll find a Judas window in practically every room. “The trouble is that so few people ever notice it.”

First published in 1938, The Judas Window is considered by many to be the best locked room mystery of all time. Carter Dickson is, of course, the pseudonym of John Dickson Carr, the universally acknowledged grand master of the form.