Sherlock: For Holmes and Watson, the game is afoot
I still have the first Sherlock Holmes book I ever owned. It had a purple spine (the purple of one of Holmes' dressing gown, I liked to imagine), a Sidney Paget illustration on the front and a wonderful introduction which ended with the magical words, "I wish I were reading these stories for the first time."
I can remember the frisson I felt then. I was reading them for the first time!
Now, more than 30 years later it's sheer delight to bring a modern-day Sherlock to BBC One. It came about as a result of very pleasant chats with Steven Moffat as both of us travelled to and from Cardiff for various Doctor Who duties.
It seems nicely fitting that it all started on a train. We're both huge fans of the original stories and the absolute copper-bottomed genius of Arthur Conan Doyle's writing.
It didn't take long, though, for us both to shyly admit that our favourite versions of the oft-told tales were the Basil Rathbone/Nigel Bruce films of the 1930s and 1940s. Particularly the ones where they brought them up to date.
This may sound like heresy but really it isn't. Although Steven and I are second to none in loving the flaring gas-lit atmosphere of a lovely old London, it felt as though Sherlock Holmes had become all about the trappings and not the characters.
Also, the original stories are models of their kind. Incredibly modern, dialogue-driven, fast paced and short! What better way to get back to the roots of these fantastic creations than to make Holmes and Watson living, breathing, modern men just as they had been originally?
Happily for us, the BBC were immediately excited at the idea of modern Sherlock Holmes.
Some might think that's a depressing indicator of our major broadcaster falling back on the most familiar of fictional archetypes, but it isn't. Sherlock Holmes may be the most filmed character in all fiction but to reinvent him for a new audience - as well as fans - is not just thrilling and exciting, it's an honour.
From the very outset, what excited us was the very rare chance to go right back to the beginning. To get to the heart of the characters.
A chance meeting with an old friend leads to him sharing rooms with a mysterious man called Sherlock Holmes. For 'sharing rooms', read 'flat-share'! Again, you don't have to strain for the modern parallels. If anything, the idea of two bachelors living together is more common now than in the 19th Century.
And then there's the immortal first meeting between the two men destined to become the best, but least likely of friends. It's still in Bart's Hospital, we still have young Stamford. What's thrilling, though, is that this legendary moment has hardly ever been dramatised.
And so a new audience gets to meet Sherlock Holmes through John Watson's eyes and ask the question: who are you?
After that, it was all fun with perplexing decisions! What are the immutable aspects of the characters and the stories? They'd call themselves Sherlock and John now, of course. Who calls their best friend by their surname?
Doyle wrote of Holmes having a "certain quiet primness of dress" so we've made Sherlock a neat, almost conservative dresser. Yet he needs to feel different. Special. So the Byronic Benedict in his big winter coat can't possibly wear a paper forensic suit or it's all too CSI.
And what about that? Doyle virtually invented forensic detection. How can Sherlock exist in a world where the police do all the finger-printing, criminal profiling and analysis that were once his unique attribute?
The answer, in our version anyway, is that Sherlock Holmes is still, and always, the best and wisest man there is. The police may be able to put clues together, but only Sherlock has the vast brain power and imagination that can make the huge leaps of deduction.
As for Watson's stories for The Strand magazine, he now writes up their adventures in a blog. It is online for all to see, including references to the cases we'll never know about!
Addressing the heresy once more, I can only say again that Sherlock Holmes and Dr Watson are immortal. It's been a privilege and a thrill to put our new version of Doyle's blessed and wonderful creations onto the screen. We hope you enjoy. The game is on!
Mark Gatiss is the co-creator of Sherlock and writer of episode three.