The BBC's miniseries Sherlock was created by Steven Moffat and Mark Gatiss and aired from 2010 to 2017 for four seasons and one special, Victorian-era episode. Sherlock brought the Great Detective, Dr. John Watson, and other characters from Conan Doyle's books to modern-day London, adapting various Holmes cases to a modern setting, technology, and social issues.
The only official sibling Sherlock Holmes has is Mycroft Holmes, so Eurus was an original addition to the BBC's series – however, her introduction and role in the series wasn't done correctly. Eurus was a villain and the most intelligent of the Holmes siblings, making her an evil genius. Because of this, she was sent to Sherrinford, a maximum security psychiatric facility, where she ended up taking control thanks to her dangerous manipulation skills.
Eurus was an unbelievable character due to not being part of the canon, the sudden way she was introduced, and her forced place in the series, and Sherlock & Daughter is at risk of repeating this. Sherlock Holmes having a daughter is hard to believe as Conan Doyle never gave him a love interest (the closest to it was Irene Adler) and he was never interested in any type of romantic relationship.
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