The Method of Evidence

The investigation shows how a detective must revise attractive theories, distinguish unrelated crimes and treat the smallest physical facts as meaningful.

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A Familiar Suspect

The Easy Explanation A threat becomes a clue Jacqueline has publicly threatened Linnet and owns the pistol used in the apparent murder. The J on the wall seems to confirm what the investigators already expect. Suspicion is not proof Poirot does not confuse a strong motive with a complete explanation. Jacqueline’s position under supervision and the missing weapon make the apparent solution unstable.

The Alibi Checked

Accounts Compared Witnesses establish the timeline Fanthorp and Cornelia describe the shooting in the saloon; Miss Bowers confirms that Jacqueline remained under her care. Their separate accounts make her opportunity to kill Linnet implausible. Order before accusation Poirot establishes when each person was present and what they could have done. The investigation advances by checking opportunity rather than responding only to emotion.

The Pistol’s Contradiction

A Clue with Two Histories Evidence inside the wrapping The velvet bears marks of a shot fired through it, but Linnet’s wound was made at close range without that wrapping. The pistol’s journey therefore includes more than the murder itself. An unresolved question Race proposes panic, but Poirot asks why a killer who intended to frame Jacqueline would remove the very weapon that supported the frame. The inconsistency leads back to the crime’s true timing.

Small Details Accumulate

Ink, Stains and Timing Physical traces Poirot notices the nail-polish bottle with red ink, the faint pink stain on a cheap handkerchief and the mismatch between the wrapped pistol and the fatal wound. Each detail weakens the simple story. Separating crimes The false necklace, Marie’s stealing and Tim’s visit create additional distractions. Poirot keeps those discoveries distinct from the question of who killed Linnet.

A Theory Rebuilt

The Facts Reassembled The hidden sequence Poirot interprets the witnesses, the gap in the alibis and the later killings as parts of a plan designed before dinner. He recognizes that the apparent spontaneity was staged. A disciplined conclusion The solution succeeds because he returns to the beginning and tests the theory against every fact. The novel makes correction, not certainty, the foundation of method.

Immediately after Linnet’s murder

During the first interviews aboard the Karnak

After the weapon is recovered from the Nile

During the cabin searches

Near the end of the return journey