Sir Arthur Conan Doyle's Sherlock Holmes - the world's greatest detective - faces a most alluring adversary... Legendary opera star Irene Adler is threatening to destroy the King of Bohemia's reputation with proof of their illicit affair. The evidence? A photograph. Her ransom? The king's hand in marriage. But not only does investigating detective Sherlock Holmes already know Irene from the past, he also knows that the queen of manipulation would never resort to such a common crime. After uncovering her true ambitions, Holmes draws the cunning songstress into a well-matched game of cat and mouse.