The only person to have outwitted Sherlock Holmes. Appears in exactly one story — A Scandal in Bohemia (SCAN) — but is referenced throughout the Canon as “the Woman.”
Background (from SCAN)
- American opera singer (contralto); born New Jersey
- Former intimate of the King of Bohemia; holds a compromising photograph of them together
- Married Godfrey Norton (an English lawyer) the morning of Holmes’s investigation
- Fled England with the photograph before Holmes could retrieve it, leaving a letter addressed to Holmes
Significance
Holmes is tasked by the King of Bohemia to recover the photograph. He disguises himself (as a groom, then as a clergyman), stages an incident to learn where she hides her valuables, then returns to retrieve it — only to find she has already gone, leaving behind a different photograph (of herself alone) and a letter proving she knew who Holmes was and what he was doing.
“To Sherlock Holmes she is always the woman. I have seldom heard him mention her under any other name.” — Watson, opening paragraph of SCAN
Holmes keeps her photograph. The implication — carefully maintained as ambiguous by Doyle — is that Holmes admires her intellectually, not romantically. She is the one adversary who read him rather than the reverse.
Cultural significance
Irene Adler appears in exactly one canonical story yet has become one of the most prominent figures in Holmes adaptations. Her role has been dramatically expanded in modern retellings, often romanticised in ways the Canon does not support. The original story is notable for how quickly her victory is settled — she does not stay to fight; she simply wins and leaves.