Irene Adler is another of the fictional characters in the Sherlock Holmes novels written by Sir Arthur Conan Doyle. A former opera singer and actress she was first featured in the short story, "A Scandal in Bohemia" published in 1891.
Miss Adler is one of the most notable female characters in the stories of Holmes.  While not quite a criminal and bearing no malice towards the great detective, she outsmarts him and often evades many of the traps he has set for her.
Despite all of this some people interpret Miss Adler as a possible romantic interest for Holmes or perhaps a former lover who occasionally dabbles in crime.
Irene Adler's previous profession on the stage and in the concert hall point to a very intelligent woman whose looks, poise and intelligence would and could attract even the cool, calm and collected Sherlock Holmes!