A dark mystery buried in the history of a dying empire which generations of Sherlock Holmes enthusiasts could never solve - until now.
What did Arthur Conan Doyle mean by that now infamous remark, uttered towards the very end of his life, that the only Sherlock Holmes story with the power to intrigue him was 'The Adventure of the Second Wife'? For there was no such story.
It falls to an unlikely pair - a London doctor and a literature...