约翰·狄克森·卡尔（1906－1977）

史上最伟大的推理小说作家之一，举世公认的“密室推理之王”。其小说素以公平著称，线索隐蔽，解答惊人，具有超乎寻常的逻辑性、趣味性。他一生共设计了超过五十种密室，几乎每个都是构思精巧、无以复加；又兼其小说一贯具有的浓郁哥特风格，以及其谋篇布局的架构能力之强，自会让读者大呼过瘾，竞相传读。读推理，岂能不读密室；读密室，岂能不读卡尔！

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.