The Adventurous Exploit of the Cave of Ali Baba is a very strange Lord Peter story. It’s primarily an adventure story, though it has minor elements of mystery to it. The mystery is primarily about how Lord Peter plans to get out of the trap he walked into, so in a sense it’s backwards from the normal situation in which somebody has used their intellect to mess things up and the detective uses his intellect to put them back together; here Lord Peter has used his intellect and we watch the villains try to match wits with him. As I’ve noted in other reviews of short stories, this will contain spoilers. That said, I don’t think that the story will be all that surprising.
The story begins with the announcement of the death of Lord Peter Wimsey on a hunting trip in Tanganyika. I don’t really like that sort of device, myself, though it’s really just an annoyance because no one believes for a moment that Lord Peter was actually killed off at the beginning of a Lord Peter Wimsey story. But this device also stretches one’s imagination to the breaking point. It seems very out of character for Lord Peter Wimsey to pretend to be dead for over two years in order to catch a criminal gang. Granted, it is supposed to be a superlative criminal gang, but at the same time it is limited to 50 members who don’t know each other. And this presents real problems.
Even granted that most of its members are among the most capable in the world—and Lord Peter got in pretending to be an ex-footman whose only real value was in knowing the household routine of a number of great houses—fifty people is still not enough to silently carry out executions in prisons and other things like that. To carry out executions in a jail one would need at an absolute minimum two men on the inside. But they can’t work together if they don’t know each other, since they would have to act with the authority they have. The rule that no one knows who anyone else is (save Number One, who knows everyone) severely limits the sorts of conspiracies which can be undertaken. Also a problem for the gang is that there is more than one jail in London. I suppose this could be solved by having assassins who can sneak into and out of the jail to perform an execution, but that does nothing to restore credibility to the story. The society does not train people in secret schools and with only fifty members most of whom are skilled at performing robberies, they will have more than a hard time recruiting uber-assassins. The problems go on; fifty men can do a lot, but they can’t be everywhere, especially in England during the interwar period when telephones were relatively new inventions.
Which brings us to the science fiction element of the story: the voice-activated sliding door. Certainly this is very possible today, and if one is willing to stretch a bit it is possible that it could have been done using the technology of the 1920s. How one could do it using the technology of the 1920s that allows more than one try, I don’t know, and certainly the explanation of a needle tracing vibrations gives no clue. That mechanism could work once, perhaps by depositing a conductor. Actually, come to think of it, if the needle and the trace were conductive, the thing could be hooked up to a timer which will activate if the needle closes the circuit for a minimum amount of time. That could give most of the desired properties, though I will also note that the thing would require an enormous amount of precision. Granted, Lord Peter could pay for such precision, but delicate and experimental machinery is an odd thing to gamble a man’s life on. Granted, a very bad man. In any event such technology lacks the wow factor it would have had to readers in the 1920s. And further, it seems a bit gratuitous. Maybe it’s just a long history of wildly complicated plans in fiction together with most plans that are even mildly complicated going terribly wrong in real life, but the whole thing seems needlessly elaborate without having a corresponding coolness to make the reader not care about the over-elaboration. This may perhaps be related to the way that such a door would now just be expensive but not at all technologically difficult; that would remove the coolness but not the original elaborateness. Alas, not all stories are meant for the ages. On the plus side, the ones that aren’t tell us more about the time period they were written in, since they don’t transcend their time.