Alternate History Masterclass
The BBC press release for its Christmas programming includes a mindboggling what-if speculation:
'Sherlock. "Dr John Watson, meet Mr Sherlock Holmes." We've been here before – but what if this wasn't the modern day but the late Victorian period? What if the world's most famous consulting detective and his best friend lived in a Baker Street of steam trains, hansom cabs, top hats and frock-coats?
Welcome to "Sherlock" in 1895!'