Moriarty The Patriot Vol.6 English Version Manga

In order to negotiate with Irene Adler in secret, Count Albert Moriarty arranges a masquerade ball at Buckingham Palace. What is the secret contained in the documents Miss Adler stole? And what is she really after? The Lord of Crime, the Great Detective, and the Beautiful Thief battle it out in the shadows while the fate of London rests in their hands.