Stories / The Memoirs of Sherlock Holmes · 1893
The Naval Treaty
A secret treaty vanishes from a Whitehall desk while the bell-rope is still swinging; the thief was always closer to home than the clerk dared think.
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⚠️ Spoilers below. The analysis discusses the solution, including who did it and how it's found out.
Summary & analysis
Percy Phelps, Watson's old schoolfellow, copies a secret naval treaty after hours; a bell rings in his room, and in the minute it takes to answer, the treaty is gone — followed by nine weeks of brain fever while his career and engagement hang.
Holmes maps who could have known the treaty was there that night: no one — so the theft was opportunity, not plot. The commissionaire's wife, the fiancée's brother lodging in the sick-room, and the geometry of the bell-pull all get weighed; a night watch at Woking catches a man at the window-sill.
Joseph Harrison, ruined on the Stock Exchange, took the treaty on impulse and hid it under the sick-room floor — then was locked out of his own cache by the invalid's nine-week occupancy. Holmes retrieves it and serves it to Phelps under a breakfast cover: theatre as restorative.
Deeper reading
A negative deduction
The Naval Treaty, one of the longer Memoirs, hinges on a clean piece of negative reasoning: since no one could have known the document would be on the desk that night, the theft was opportunistic, and the culprit must be sought among those with accidental access and sudden need — not among planners. Doyle shows the method working by exclusion rather than pursuit.
Theatre as restorative
The famous breakfast reveal — Holmes serving the recovered treaty under a dish-cover to the invalid client — is pure showmanship, and a reminder that Holmes stage-manages his triumphs for effect. Beneath it is a study of the near-fatal weight of shame and duty on a young official, a note of real feeling in an otherwise procedural tale.
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Techniques on display
Elimination
Striking out the impossible until the truth remains.
In this story: The key inference is negative: since no one could have known the document was there, everyone with a plan is innocent — search instead for who had accidental access and sudden need.
Chronology
Laying events end to end until contradictions die.
In this story: The bell is the thief's own error, rung by a man surprised mid-theft; ringing time against corridor times shrinks the suspect field to whoever was already inside the geometry.
Practise what this story preaches: every technique above links to a tool or game built on the same method. The best way to learn the canon is to reason along with it.