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The specter of drug trafficking haunts Europe. Struggling with ultra-violent criminal groups that control the vast majority of cocaine trade, European police forces are overwhelmed. The epicenter of all this trafficking: the Netherlands. A nation at the forefront of international trade and drug policy. This two-part film delves into the origins of European drug trafficking through the unique history of the Kingdom of the Netherlands.

This is the story of a power struggle between two men - one fictional, and one real. In one corner is the master of crime – the greatest detective who never lived, Sherlock Holmes. In the other is writer, physician and spiritualist leader Sir Arthur Conan Doyle. Lucy Worsley explores the extraordinary love-hate relationship between author and creation.

From dangerous explosives and deadly curses that put everyday people at risk, to treasures found in the unlikeliest of ways, each episode digs into the people, the places and historical significance of these discoveries. And sometimes just being in the right place at the right time can make history…because nothing stays hidden forever.