The Judas Window (aka, The Crossbow Murder and The Bowstring Murders) features both a locked room murder and a dramatic courtroom explication of how the murderer pulled off such an impossible crime. Avery Hume, master archer, is found dead from an arrow shot into his heart. The only other person in the locked room is young James Answell, Hume’s future son-in-law who is charged with the murder. Answell claims he was drugged and when he regained his consciousness, Hume was dead. Crusty barrister Sir Henry Merrivale untangles the twisted plot and reveals not only the real killer, but manages to punish a blackmailer in unique fashion, too. This is the first time I can recall nude photographs being part of a locked room plot. If you like mind-boggling puzzle mysteries, The Judas Window is one of the best. Thanks go to Art Scott for recommending it!