Recently I have been thinking about immortality, not the human and aspirational kind, typified by one of our billionaires who apparently wants to sleep his way to eternity, but the curious immortality of certain literary creations. What mysterious secret ingredients has kept folks like Oedipus and Antigone, David and his rival Goliath, Medea, and Orpheus, and the notables of the Hindu epics evergreen and ever present?
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Sure, a strong connection to an historic religion is a big help, but not essential, considering the continuing presence of our genre's Sherlock Holmes. Not content with retelling his adventures in every medium except dance and opera, we have retired him, married him, gifted him with a daughter and saddled him with multiple bee hives.
He's been treated for addiction – by Sigmund Freud, no less; brought into the 21st century with Sherlock, and just recently restored to callow youth by Young Sherlock, wherein he works as domestic help in Oxford, crashes parties with a louche undergrad named Moriarty, and gets acquainted with a Chinese princess who is a master of both armed and unarmed combat.
Is anything new possible? Well, yes. In The Final Problem, Arturo Perez-Reverte has come up with an angle that I confess I exploited nearly a decade ago: a mystery employing not the great man himself, but one of his impersonating actors. Together, The Final Problem and my own Holmes Impersonator stories provide two more ways to exploit the great detective.
I did not have ambitions to enlarge Sherlock's already expansive realm when I ventured into Holmes territory. I had hopes of breaking into a lucrative weekly supermarket tabloid, and I had come up with what I thought was a clever plot. In the service of this idea, I needed a detective and for reasons unknown, the Holmes Impersonator arrived.
A journeyman actor, employed by regional theaters and the dinner circuit with occasional voice- over or advertising work, my detective makes some extra cash with a regular gig at The Sherlock Holmes Museum, a small private Connecticut outfit with a slim budget and a constant need for donors. I thought he was ideal; the tabloid editors thought differently.
But the Impersonator was resilient. He found a home at Sherlock Holmes Mystery Magazine where he proved to be a clever guy, a useful narrator for six outings, and surprisingly observant. His flaw is his appearance. As child visitors to The Sherlock Holmes Museum invariably observe, he doesn't look like Sherlock. Indeed, tapped for a PBS revival of Sherlock Holmes, the famous play that made star William Gillette rich enough to build Connecticut's one and only castle, he gets cast as Watson.
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No such troubles for Perez- Reverte's Basil Osmond, who has the hawk nose and elegant physique of the famous Sidney Paget illustrations. Basil has instant credibility, because he not only looks the part but has played it in over a dozen immensely popular films.
Clearly based on Basil Rathbone, the famous 20th century Sherlock, Perez- Reverte's detective comes with an encyclopedic knowledge of Conan Doyle stories, an almost instant recall of Holmes' famous lines, and the savoir faire of having temporarily been rich and famous and on intimate terms with both London's West End and Hollywood royalty.
Such a character clearly deserves a mystery, and The Final Problem soon sets one for him. Basil has been sailing with a producer who may cast him in an upcoming television series. A storm strands them on a Greek island, one conveniently equipped with a luxury hotel inhabited by other temporarily stranded visitors.
Long time mystery fans will recognize that this setup is far from the atmospheric fogs of Baker Street. We are, in fact, in Agatha Christie territory with nine visitors, the hotel proprietor and three in staff, and very soon we have a corpse, a lot of questions, and no way to get help from the police.
Granted the authority to conduct an investigation, Basil, at first reluctantly and then with considerable flair and enthusiasm, sets to work, assisted by a fawning Spanish mystery writer and fellow Holmes buff.
The plotting, more clever than plausible, gives Basil scope, even if the somewhat awkward epilogue makes clear why Agatha Christie favored dramatic revelations before the assembled suspects.
So, here are our two alternative performers. The low- budget Holmes Impersonator, modest but effective in the compass of short fiction and a small locale, and a famous Sherlock in a luxury setting and the Christie- type plot suitable for a full length novel. Are there room for more such characters? I suspect so.
And what of the secret ingredient, the source of such characters' longevity? I am still far from a solution, but part must be the presence of what the great Scottish philosopher David Hume declared essential to knowledge: a clear and distinct idea.
Sherlock provides that in spades: the pithy phrases, the investigative dictums, and, of course, the instantly identifiable costume. Put a dog or a cat in a deer stalker and an Ulster, hand them a meerschaum pipe and either is instantly recognizable as a detective of this very special type. With a brand like this, no wonder other writers are tempted to enlist him in their literary ventures.

