Most continuity slips in a long series are invisible on the page, because nothing in the sentence breaks. A wound is a perfect specimen. It is backstory: stated once to explain a character, then recalled years later from memory instead of from the book. Arthur Conan Doyle wrote sixty Holmes stories over forty years, from 1887 to 1927, and a slip Holmes readers still argue about arrives in the second novel.
Here are the two passages, quoted from the Project Gutenberg texts of both public-domain novels. Unlike the other entries in this casebook, nothing here is invented.
What actually drifted
Why it happens: backstory is written once and recalled for years
In A Study in Scarlet, the wound does real work. It is why Watson is back in London, invalided out with “neither kith nor kin in England,” looking for cheaper rooms, and so why he meets Holmes at all. Doyle stated it once, precisely, and moved on.
Three years later, writing The Sign of the Four, Doyle needed something else from the same wound. Holmes has just dismissed Watson’s account of their first case, and Watson, irritated, says nothing. A man nursing an old injury is a natural picture of quiet irritation. The detail was not looked up in the first book. It was written fresh for the new scene, and it arrived with the confidence of memory.
That is why the slip survived. Reread either novel alone and it is flawless. The contradiction exists only across the seam between the books, and writers reread, and editors check, one book at a time. Scale makes it worse. By the end Doyle had written four novels and fifty-six short stories, and no one holds every detail of sixty stories in working memory. Neither does the author of a five-book series.
How readers caught it, and why it never went away
The readers who catch a slip like this are the ones who read the books together, holding the first book’s facts while they read the second. Holmes readers have done exactly that for generations, and the wound has become a well-known puzzle among them. Readers have offered their own explanations, from two separate wounds to a bullet that travelled, but neither novel says so.
A later story sidesteps it. In “The Adventure of the Noble Bachelor” (1892), Watson describes “the jezail bullet which I had brought back in one of my limbs as a relic of my Afghan campaign.” One of my limbs. Even the narrator stops saying which.
For Doyle, the slip became trivia that fans enjoy. For an indie author on book five, the same kind of slip tends to surface in a review, written by the reader who cared enough to notice and read by the next buyer before they decide.
How StoryHelm caught it without being asked
We gave StoryHelm the Project Gutenberg texts of both novels as a two-book series: A Study in Scarlet as Book 1 and The Sign of the Four as Book 2. Then a cross-book check compared what the two books record. No one asked it about Watson, or about wounds.
The check opened six threads in Continuity Watch, the inbox where StoryHelm keeps the differences it finds between books. Thread three reads: “Jezail bullet: description differs between Book 1 and Book 2.” Book 1’s record says “Bullet that wounded Watson’s shoulder.” Book 2’s says “Wound in Watson’s leg from Afghan campaign.” The two records sit side by side in the thread, each tied to its book, with two choices for the author: It is intentional, or Not now.
Two honest notes. First, not every thread is an error. The same check also opened threads about an oak cudgel and about Watson’s role, and each one waits for a person to make the call, which is the point of an inbox. Second, this is a saved check whose evidence shows each book’s recorded description rather than the quoted passage, so the passages above are quoted from the Gutenberg texts.
StoryHelm reads and analyzes each book in your series. It never writes a word of your prose. As it reads, it records each book’s characters, places, events and items in your Canon. A cross-book check you start from your series’ Checks page compares what two books record and opens a thread for each difference it flags, naming both books and what each one records.
- What it caught here: the shoulder in Book 1 against the leg in Book 2, recorded on the Jezail bullet, with both books’ records side by side.
- What stays with you: which wound is canon, and every later scene that leans on it: Holmes reading a stiff left arm on sight, a limp in a later book, an ache before rain. A check flags the difference it sees; following it through the rest of the series is your read.
StoryHelm does not decide whether the shoulder or the leg is right; you do. The steps below are how you settle it.
The fix is a decision, not a correction
Doyle never had to settle it. You do, and once both passages are in front of you, the work is fast:
- Put both passages side by side. Tag each with its book and chapter, so no one has to remember which book had the shoulder.
- Decide the canon. Shoulder or leg? Book 1 explains the wound, and Holmes deduces it from a stiff arm, so the shoulder carries more of the story. Either way, it is a craft decision, not a typo to patch quietly.
- Resolve once, then walk the scenes that lean on it. Settle the wound, then check by hand every later scene that touches it: the limp, the ache before rain, the moment someone notices the scar.
- Or make it intentional. If the wandering wound is a clue, an unreliable narrator or a running joke, mark the thread intentional in Continuity Watch, so you and any editor read it as a choice, not a slip.
That last option is the whole idea. The aim is not to freeze your series. It is to make sure every detail in it is one you chose, including the ones a narrator gets wrong on purpose.
Questions readers ask about Watson’s wound
Where was Dr. Watson wounded?
In A Study in Scarlet (1887) Watson says a Jezail bullet struck his shoulder at the battle of Maiwand, shattering the bone and grazing the subclavian artery. In The Sign of the Four (1890) he nurses a wounded leg with “a Jezail bullet through it.”
Did Arthur Conan Doyle explain the change?
Neither novel does. In “The Adventure of the Noble Bachelor” (1892), Watson says only that he brought the bullet back “in one of my limbs,” and readers have offered their own explanations since.
Is Watson’s wound a continuity error?
It is a classic cross-book continuity error: one fact, recorded by the same narrator in two books three years apart, that cannot be true in both places. Each book reads correctly on its own.
Can software catch an error like this?
StoryHelm flagged it when it read the two public-domain novels: a cross-book check opened a thread saying the Jezail bullet’s description differs between Book 1 and Book 2, with each book’s record side by side. Deciding which version is canon stays with the author.
The same kind of drift in an invented series: The Scar That Switched Hands follows a duel scar from the left hand to the right. For the mechanics behind the check, see what an AI continuity check actually does.