The Problem of Thor Bridge was first published in 1922, making it one of the last Sherlock Holmes stories published in The Strand Magazine and towards the last of the Holmes stories published anywhere. (Only ten Holmes stories were published after, the last in March of 1927.)
By this time, other detective stories were well underway. Dr. Thorndyke had been solving cases for fifteen years, Father Brown had been solving cases for twelve years and Poirot for two. I don’t know whether Sir Arthur ever read any of these stories, or to what degree they influenced him. It seems possible, though, as this is one of the only Holmes stories in which there is a ingenious murder device, that is, with a clever and unusual method of committing murder. Far more common in Holmes stories are fairly ordinary means of committing murder that only left a few clues behind. (As well, there are plenty of non-murder cases entirely. Possibly the majority—I haven’t counted.)
Technically all the villain got away with, in the story, was self-murder, and merely attempted to murder the woman she hated by setting the scene to look like murder and framing her rival. It was still a very clever and original technique for murder.
For those who aren’t familiar with the story, Mrs. Maria Gibson was jealous of miss Grace Dunbar, the governess of her children, because her husband had fallen in love with Miss Dunbar. Mrs. Gibson made an appointment with Miss Dunbar for a certain time in the evening and had Miss Dunbar confirm it with a note. After Miss Dunbar came, Mrs. Gibson insulted her until she ran away. Once Miss Dunbar was safely out of earshot, she tied a heavy rock, with a long piece of twine, to a gun, and shot herself, with the note clutched in her other hand. When she fell dead, the rock pulled the gun over the edge of the bridge and into the water below. The final piece of evidence against Miss Dunbar was a duplicate gun, planted in Miss Dunbar’s wardrobe.
The absence of the gun was very strong evidence against suicide, and the timing selected gave most people, except for Miss Dunbar, an alibi for the time of death. It’s quite clever.
I find it curious that this means of murder has been copied so little. I couldn’t think of any examples, and the Wikipedia page mentions only two TV shows which have borrowed the idea, one CSI in an episode titled Who Shot Sherlock? The other is a Murder, She Wrote episode from the eighth season titled To The Last Will I Grapple With Thee.
I watched that episode of Murder, She Wrote, as I didn’t remember it. It’s a good episode, though a bit strange because most of the cast are Irish immigrants; most of the cast except for Jessica Fletcher and the Police Lieutenant speak with an Irish brogue. It’s one of the episodes set in New York City when Jessica is teaching classes as some university. There’s an Irish ex-policeman who moved to America to start a new life, with his adult daughter, and he’s pursued by a career criminal from Ireland, with whom he had a long history including having tried to win the hand of the same woman, who tries to frame the ex-policeman for his murder. He uses a weight on a string tied to a heavy weight to hide the gun in the open cavity of an unfinished wall, but Jessica spots the marks the gun made on the wall and deduces what happened. It turned out that the career criminal had an inoperable brain tumor, and since he had so little time left, he decided to make one last attempt to get back at his old enemy.
He is explicitly likened to Ahab in Moby Dick, and a part of Ahab’s final speech is quoted. It’s worth quoting in full (if you haven’t read Moby Dick, Ahab had dedicated his life to veangeance against the white whale, who has just rammed Ahab’s ship, the Pequod, and the ship is sinking).
I turn my body from the sun. What ho, Tashtego! let me hear thy hammer. Oh! ye three unsurrendered spires of mine; thou uncracked keel; and only god-bullied hull; thou firm deck, and haughty helm, and Pole-pointed prow,—death-glorious ship! must ye then perish, and without me? Am I cut off from the last fond pride of meanest shipwrecked captains? Oh, lonely death on lonely life! Oh, now I feel my topmost greatness lies in my topmost grief. Ho, ho! from all your furthest bounds, pour ye now in, ye bold billows of my whole foregone life, and top this one piled comber of my death! Towards thee I roll, thou all-destroying but unconquering whale; to the last I grapple with thee; from hell’s heart I stab at thee; for hate’s sake I spit my last breath at thee. Sink all coffins and all hearses to one common pool! and since neither can be mine, let me then tow to pieces, while still chasing thee, though tied to thee, thou damned whale! Thus, I give up the spear!
The most famous of the lines is, of course, “to the last I grapple with thee; from hell’s heart I stab at thee; for hate’s sake I spit my last breath at thee”. (It was also quoted very well by the dying Khan, in Star Trek II: The Wrath of Khan, as Khan self-destructed his ship to try to kill Kirk. Ricardo Montalbán was a good actor.) You wouldn’t think that Murder, She Wrote could pull this sort of true drama off, but somehow it did.
I’ve never seen CSI and have no intention of seeing it, so I can’t comment on it, but I find it curious that the only place this murder device has been used was in long-running TV shows, which have a huge demand for material, and only after many years. And in the Murder, She Wrote episode they played somewhat fast and loose with the wall having an open cavity in it. They never really showed us that it had that feature.
I wonder why this is. Is it just that copying the greats feels cheap? But copying the greats is usually the best strategy for a writer, at least while making it one’s own. Mediocrity borrows, genius steals, and all that.
Perhaps it’s just that the disguised suicide of The Problem of Thor’s Bridge is so recognizable? If a body was found on a bridge with a chip in the stonework, a modern audience might scream if the detective does not immediately dredge the lake or stream for the gun. Yet, I have not seen even variants of this—murdering someone and then dropping the gun over a bridge with a rock on a rope to disguise the murder as suicide-disguised-as-murder. With modern materials one need not even use a rock a a counterweight. Elastics, springs, and other things would expand the range of hiding places for a murder weapon. It is, at least, an interesting direction to explore.