Sherlock Holmes: The Golden Years Collection

1910. Mycroft Holmes asks his brother Sherlock and Dr. Watson to travel to Vienna and find the stolen plans and prototype for an electromagnetic bomb detonator. Once there, they are reunited with Irene Adler, who has once more taken up her former profession as an opera singer.

1910. At the behest of King Edward VII Sherlock Holmes and Dr. Watson set off for Cape Town. The Star of Africa, the largest diamond in the world, is being shipped to England and Holmes is to ensure that it reaches the King safely. In South Africa Holmes discovers that not only is a plan afoot to steal the diamond but the perpetrators are willing to resort to murder to achieve their ends.