That's what makes characters interesting. If Sherlock [Holmes] had started out being a straightforward man, we wouldn't be talking about him now. If he became one, that would be interesting. But you have to give him somewhere to go, as [Conan] Doyle did.

The thing is, horror is a big part of 'Sherlock Holmes.' Doyle also wrote a lot of great horror stories, so there's a lot more horror in 'Holmes' that people possibly think of. There's a lot of curses and mysticism and real scares.

Europe is so much the home of Horror, with its myths of vampires, werewolves, witchcraft and the undead, yet it's like those myths were exported to Hollywood, leaving Europe the room to develop a new tradition as a way of processing its traumas, particularly the two world wars.

[Toby Jones] is completely different. It's a completely different character. He's the darkest villain we've had. There was always something charming and engaging about Moriarty. There was something fascinating and actually amoral, rather than immoral, about Charles Augustus Magnussen. This guy is the purest evil. Sherlock [Holmes] is actually appalled by him.

The question I ask myself is: have I really just become a squeamish middle-aged man, or has something happened to the horror genre that shows a growing appetite for watching torture, or at least a desire to explore it on film? And if so, why would that be? I can't pretend I know. I just know I don't like it.

I prefer sneaking in the back door.

When I was seven or eight, I was bought a fantastic book called 'The Movie Treasury of Horror Movies' by Alan G. Frank; it became my bible. It's packed full of the most amazing photos and is still fantastic to look at.