A case of blackmail threatens to topple the monarchy itself, but soon Sherlock and John discover there is even more to it than that. They find themselves battling international terrorism, rogue CIA agents, and a secret conspiracy involving the British government.
But this case will cast a longer shadow on their lives than they could ever imagine, as the great detective begins a long duel of wits with an antagonist as cold and ruthless and brilliant as himself: Irene Adler.
Watch all episodes of Sherlock here. Sherlock is a tv-programme of BBC One. Are you a fan of Sherlock? Mark it as your favourite. Furthermore, you will receive personal television tips and programme suggestions based on your preferences. You can see all episodes of Sherlock here via Youriplayer.co.uk.
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