Sherlock: 10 Biggest Plot Twists

9. Redbeard Is A Human Not A Dog – The Final Problem

sherlock season 4
BBC

‘The Final Problem’ was a strange way for the show to finish. Though it was a non-stop thriller from start to finish, it also felt rather ridiculous at times. Nevertheless, this patchy episode also contained a well-executed plot twist.

At the beginning of the episode, Mycroft reveals that Eurus (his younger sister) was taken to a mental institution after burning the family house down and killing a dog named Redbeard.

However, at the end of the episode it is revealed that Redbeard was in fact a boy named Victor Trevor who had been Sherlock’s best friend as a child. Eurus – angry at the lack of attention from her older sibling – had thrown Victor into a well.

As with the overall tone of the episode, such a revelation is rather far-fetched. Yet part of the reason it works so well is due to how it is revealed. Indeed, Watson discovering the bones of a child at the bottom of the well is a creepy and effective way for such a twist to be unveiled.

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