Irene Adler

Irene Adler is a fictional character in the Sherlock Holmes stories written by Sir Arthur Conan Doyle. A former opera singer and intelligent opponent to Holmes, she was featured in the short story "A Scandal in Bohemia", published in July 1891. Adler is one of the most notable female characters in the Sherlock Holmes series, despite appearing in only one story. In derivative works, she is frequently used as a romantic interest for Holmes, a departure from Doyle's story, in which Holmes exhibits a platonic admiration for her wit and cunning.

(Source: Wikipedia)