The book, one of the rarest in modern times, is all the more special as the Edinburgh-born author signed it, making it one of only two inscribed copies of a Sherlock Holmes novel in existence.
Sir Arthur Conan Doyle only received £25 for his efforts, but this week someone could pay nearly half a million pounds for a copy of his first Sherlock Holmes adventure, A Study in Scarlet.
The book, one of the rarest in modern times, is all the more special as the Edinburgh-born author signed it, making it one of only two inscribed copies of a Sherlock Holmes novel in existence.